Emperor Battle Titan
The Emperor Battle Titan is the second largest land based weapon the Imperium of Man, or any faction even, can field (the first is a triple tie between the Capitol Imperialis super heavy tracked vehicle, the Leviathan super heavy mobile command center and the Ordinatus super heavy mobile ordinance weapons platform with its countless flavours).
Comparable to an Imperial Cathedral on legs, depending on what sources you take from it stands between approximately 43-100 metres (130-330 feet) tall (including the cathedral spires), and is quite simply the most devastating vehicle ever seen on the many battlefields of the galaxy. It is seen as a physical manifestation of the Emperor's will, and just like the Imperium itself, once they are fully deployed, they are relentless, unyielding, and unstoppable. It is similar in size to a Shark Assault Boat (the assault boat is probably not as wide, though), which is a long-range void boarding assault transport utilised in squadrons for ship-to-ship combat, typical capital ships that carry these vessels can deploy upwards of a dozen of these in addition to support weapons, which should tell you just how ridiculously huge both space combat and the land based Imperator are.
In comparison to Battle Titans of all classes, the Imperators and Warmongers are rare with most Titan Legions only able to field three or four in a campaign. Captained by only the most battle-hardened and elite of Princeps, its interior is large enough for it to serve as a mobile headquarters, with room for dozens of operators and serfs. Their crews are composed of the finest crew members from other Titans within the Legion. The Titan Legion's Grand Masters often use Imperator Titans as their mobile headquarters from where they can issue commands or lead vital assaults personally. Imperators are most often employed as vast mobile fortresses, strengthening vulnerable sectors of the Imperial battlelines or to act as a reserve force; it can also transport around a hundred Imperial Guardsmen, several times that number of Skitarii, or dozens of Space Marines in its lower legs for either close defense or to assault a shattered fortress.
The Emperor Battle Titan comes in two models: the standard 'Imperator' is an all-round assault and support vehicle, whereas the 'Warmonger' specializes in long-range fire support. The Imperator is commonly seen leading Titan assaults, while the Warmonger rains artillery on the foe with its city leveling firepower.
It is unknown which variant was designed first as this knowledge has been lost down the long millennia of the Imperium's existence. However, it is well documented that both the Warmonger and Imperator Emperor Titans were both utilised extensively long before the outbreak of the galaxy-wide conflict of the Horus Heresy.
Their only difference is in weaponry; the Imperator have shorter ranged weapons, while the Warmonger is armed with long-range artillery and missile platforms. A third Emperor with an aircraft carrier deck on its back was planned and showcased as part of the buildup to the release of Titan Legions, but sadly Titan Legions was an overcomplicated trainwreck of a system and the planned line of super-Titan variants was canned as soon as people stupid enough to buy a box containing more counters than Battle for Armageddon realized this.
More can be read below.
The previously mentioned 'all-rounder' of the two known Emperor Titan classes. The Imperator is one of the more iconic and recognizable warmachines of the Imperium. The Imperator is a Titan whose expertise resolves around tactical flexibility and relatively close-range assault bombardment (For Titan standards anyway). As such, the Imperator is armed with weapons that excels in providing immense covering fire for allied Imperial troops to take strategic positions and areas of interests, taking on and wiping out entire superheavy divisions and rival Titan legions by itself thereby relieving allied troops from immense pressure, breaching fortified and heavily armed fortresses and allowing infantry stationed within the Titan's legs to safely assault the broken defenses and acting as a giant, mobile DISTRACTION CARNIFEX that can defend a crucial geostrategic area for the Imperium. Essentially, if you have a Imperator at your back, nothing could technically go wrong in your campaign.
Likewise, Imperators are not normally equipped to fight other Titans in close combat. Instead they rely on their deadly firepower to cripple opponents before they get too close, not as if the lack of an CQC matters anyway as the Emperor both outsize and outmass its lessers to the point that the Imperator can just knock over smaller Titans with its massive and THICC legs before crushing them under its equally massive feet.
The Imperator-Class Titan carries two primary arm-mounted weapons, the Hellstorm Cannon and the Plasma Annihilator, both of which can one-shot anything that is NOT a Warlord Battle Titan. Its large cathedral-like superstructure can carry a vast assortments of secondary but no-less devastating carapace weapons which includes from a wide and diverse range of ass fucking such as the Apocalypse Missile Launcher, Gatling Blaster, Inferno Gun, Laser Blaster, Melta Cannon, Plasma Destructor, Quake Cannon, Volcano Cannon, Vortex Support Missile and the Vulcan Mega Bolter.
The Ying to the Imperator's Yang. As briefly aforementioned, the Warmonger is the second class of Emperor Titans that has a very specific niche in the battlefield. Whilst the Imperator specializes in flexibility and adaptability, the Warmonger specializes only on long-range firepower and bombardments. Pretty much every thing in the Warmonger's arsenal is designed for cracking open heavy fortified defenses from a safe distance before letting other Titans and military personnel to finish up the stragglers. The Warmonger's specialization also means that allied infantry within the Warmonger's legs behave differently, rather than acting as offensive front-liners the infantry instead act as defensive countermeasures against enemies that are closing in from all sides. Hence, the Warmonger acts as a giant, walking artillery platform. Seriously, this thing is an entire battery of Basilisks, Manticores and Deathstrikes on stilts.
This capability makes this particular Emperor Titan a magnet for enemy air support and with such a big ass target situated beyond the maximum range of enemy Titans, the only weapons that could conceivably hit the damn thing are ICBMs, Voidships and Aircraft. However through the act of Just as Planned, the Warmonger has a healthy array of anti-aircraft systems, not to mention a sufficient number of Void Shields, to keep these threats at bay.
The Warmonger-Class Titan being a giant walking artillery platform is thus, armed with weapons that can hit from the end of the horizon (Although this comes at the price of less weapon loadout and diversity). Its primary arm weapons comes equipped with a Doomstrike Missile Launcher (8 Doomstrike Missiles) and a Vengeance Cannon, weapons that could conceivably wipe out an entire town in one shot or severely cripple a Imperator Titan. Its secondary weapons are dominated mainly with four ECKSBAWKSHUEG Quad Autocannons for anti-air defense, and a Fire Control Center to link up with either scouting Vox-casters or orbiting Voidships so that either of the two can scout and accurately pin-point enemy positions so that the Warmonger can just point and shoot. The amount of space being taken up by air-defense means that the Warmonger is restricted to only three or four carapace weapons rather than the Imperator's six.
Known Emperor Titans
Because of their awe-inspiring awesomness and absolute carnage they reap on the battlefield, a number of Emperor Titans have walked countless worlds and fell on countless others in Black Library books. A few of them are listed here. As you can see below, it should be noted that if an Imperator Titan is in a book and it's Imperial, it's going to die.
- Dominatus: The Dominatus was an Imperator-class Titan from an unknown Titan Legion that fell in battle, fighting against the Forces of Chaos during the failed defence of Lorn V. Laying broken and forgotten for millennia, the lost Titan was rediscovered by the Imperium, and so, the Cadian 412th Imperial Guard Regiment, under the command of General Sturnn was dispatched to retrieve it. With the aid of the Eldar Farseer Taldeer of Craftworld Ulthwé and her warhost, who was on Lorn V for her own reasons, General Sturnn's regiment fought their way through both the Chaos Lord Crull's Blood Legion of Khorne Chaos Warband and the Warboss Gorgutz 'Ead 'Unter's Orks, reaching the fallen Titan before their enemies. Powering up the slumbering god-engine, the Imperial forces were forced to fight the ancient menace, known as the Necrons, which had begun to emerge from beneath Lorn V's surface. Despite the Farseer's betrayal, Taldeer convinced General Sturnn to aid them against this new threat, and so, they made use of the Dominatus' powerful weapons into the Necrons' advancing Monoliths, thus defeating the Necron forces. But in the process, the ancient Titan's core was ruptured in the process, causing it to explode spectacularly, killing General Sturnn and the majority of the Cadian 412th. The Eldar had managed to flee back into the Webway just before it exploded. Those few survivors of the decimated regiment, quickly spread word off-world of the treachery of the Eldar Farseer, and to the present day, their regimental banner bears a black ribbon to mark their failure to recover the ancient Imperator Titan. To this day, Sturnn's death has been met with rejection and butthurt by /tg/ as he was too cool a guy to be killed off. Taldeer that bitch...
- Exemplis: The Exemplis was the last remaining Imperator Titan of the Legio Ignatum, worshiped by the Adeptus Mechanicus as an avatar of the Omnissiah. The Exemplis saw its last action on the world of Tanakreg against a large Word Bearers Traitor Legion warhost of the Dark Apostle Jarulek. Despite the horrendous casualties it inflicted upon the heretics, the Chaos Space Marines managed to board and destroy the Exemplis after attacking its more vulnerable components.
- Mettalum Olympus: The Mettalum Olympus was a notable Imperator Titan and an absolute BOSS of a Emperor Titan; commanded by Princeps Goethe, which managed to almost single-handedly hold off a Tyranid invasion on the ash-choked plains of Horst Prime. Surrounded by an entire horde of Hierophant Bio-Titans, instead of dying like a bitch, the ancient Titan allowed the Tyranids to breach its plasma reactor when the Hierophants were close enough. The resultant explosion vapourised everything within a kilometre, leaving a crater that is still visible from orbit.
- Praeco Deictus: An Imperator Titan of the Legio Crucius, which had survived the grim days of the Horus Heresy and had won countless victories on thousands of worlds for the Imperium. The Praeco Deictus was destroyed, along with other Titans of the Legio Crucius, defending the Hive World of Kado from the Forces of Chaos. During the fighting, a hundred Slaanesh Hell-Knights infiltrated the main Hive City and emerged to attack the Imperator Titan from the rear where it was most vulnerable, turning it into a pile of molten slag. You wish we were joking, but suffice to say, Praeco Deictus suffered the most embarrassing defeat of any Emperor Titans on the list. Seriously it is one thing to lose against those flamingo walkers, but to lose against them in a seriously suggestive sexual position from the Prince of Pleasure him/her/itself is just a whole new low. Don't believe us? Just imagine a bunch of giant walking dildos penetrating the rear end of another giant humanoid walker until it climaxes and explode...seriously....
- Stormherald: An Imperator Titan of the Legio Invigilata, this titan was (and that was is rather significant) active during the Battle for Hive Helsreach during the Third War for Armageddon. Piloted by Princeps 'Crone of Invigilata' Zarha, this titan is essentially only important in two parts in the book in which it is prominently featured (Helsreach). The first is where it is booby-trapped by a bunch of Orks, the booby-trap in question being several Hive Spires filled to the brim with explosives detonating and falling on said Titan. This essentially causes The Crone to become half-subsumed into Stormherald's Machine-Spirit, only being saved by the Black Templars' Reclusiarch (Grimaldus) demanding her not to fall. And so she didn't. The titan then disappears from the book for 150 pages or so, until the Mega Gargant Godbreaker turns up in Helsreach and proceeds to wipe Armageddon's dusty wastelands with a pair of Invigilata's Warhound Titans. The Crone is none too happy about this, and (after being ordered to by Grimaldus and the guardsman in charge of Helsreach's defence) proceeds to engage in a manly and testosterone-fuelled duel to the death with Godbreaker... Which consists of the two machines standing at opposite ends of the kilometres-long Hel's Highway and shooting at each other. Stormherald's fate is sealed when a tech priest (later executed) fires its plasma annihilator too early and misses, allowing Godbreaker to wail on Stormherald until the latter finally crashes to the ground like a 400 metre tall walking cathedral would be expected to. Later, after the siege of Helsreach reaches a stalemate following the destruction of Godbreaker by the Ordinatus Armageddon, Grimaldus flies over the wreckage of Stormherald in a Thunderhawk and displays ACTUAL HUMAN FEELINGS in that he's regretful that the titan's corpse rests in enemy-held territory, and nothing can be done (due to the FUCKING WEATHER) to retrieve the god-machine's carcass. And as far as anyone knows, the body of the Titan (and the crone) are still there.
- Casus Belli: First introduced in the Gav Thorpe novel "Imperator: Wrath of the Omnissiah". Attached to the Legio Metalica, Casus was deployed against heretek defenders on the world of Necomedua (not Necromunda) which had gone rouge at some point following the Great Rift, and basically single-handedly face-fucked entire legions of traitor land forces, vehicles (including a Baneblade, which is STEPPED ON), an entire city wall, and even a few Titans. This was all a ruse, though, as the traitors planned not to destroy it or withstand the Imperium but capture the Titan itself. Their attempt, unsurprisingly, failed when one of the Mago's aboard did some pretty bad-ass stuff (and thought outside the box for once) and was backed up by a random lower-deck girl with what basically amounts to a futuristic monkey wrench.
Chaos Emperor Titan
Most of the Traitor Emperor Titans have mercifully been destroyed, but the small handful that remain are as deadly as their Imperial counterparts, if not more so. Most of them have been possessed by Greater Daemons, making them essentially supersized Daemon Engines which have transformed these great war engines into towering leviathans of Warp-corrupted steel and Adamantium, a true incarnation of the power of Chaos in the material realm.
While they are (very) rare, they are still in prime condition and are able to seriously fuck shit up. They possess similar weaponry to their loyalist counterparts but with a few extra quirks. One of which is the ability to shoot Daemons like an Angry Marine Titan, possessing several unique Chaos exclusive weaponry and lastly being possessed by the aforementioned Greater Daemon, making it tougher, almost immortal and even harder to kill.
There were several well known Chaos Emperor Titans during the Horus Heresy such as the following....
- Aquila Ignis": Commanded by Princeps Camulos of Legio Mortis, this titan participated in the battle for the Magma City against the loyalist Legio Tempestus. It got destroyed when the city was overflowed with lava to deny it to the traitors. The only component of the titan to survive was its Hellstorm Cannon, which was sent to Kronus and later controlled by the Imperial Guard during the events of Dark Crusade.
- Abominatus "Despoiler of Worlds": Abominatus is one of the most terrifying of all the servants of the Blood God. Abominatus is the hellish union of an Imperator-class Titan and a Greater Daemon of Khorne. When it walks the ground shakes beneath its steel shod feet and the enemies of the Blood God quail in fear. Abominatus carries a veritable arsenal of weapons built onto its body. Its main armament, the Hellstorm Cannon and Plasma Annihilator, along with its main battery function in an identical fashion to its Imperial counterpart. However the weapons on its main fighting platform are quite different. This Chaos-possessed Titan also has a Scorpion Cannon, a lethal multi-barrelled weapon used for close assaults and is normally mounted on Daemon Engines of Khorne. It possesses Manglers, huge battle claws which can sweep aside battle tanks and flay enemy Titans to twisted metal. As Abominatus is part daemon and part machine, this makes it particularly resistant to psychic attack as well.
- Augmenautus Rex: The Chaos Imperator-class Titan Augmenautus Rex fought against the Legio Invicta and the Legio Tempestus forces defending the Forge World of Orestes in 779.M41. It vaporized the Legio Tempestus Warlord-class Titan Orestes Magnificat with a single shot. The Princeps of the Legio Invicta Warlord-class Titan Sicarian Faero, Vancent Kung, linked his MIU (Mind Impulse Unit) with those of Titans from three battlegroups to take down the Augmenautus Rex with an assault coordinated by a single mind. Such a measure, although forbidden, was required as the Imperator-class Titan's Void Shields were so potent that they would have withstood a more dispersed assault. It is said that after the Augmenautus Rex had fallen disabled, it took another ten minutes of sustained fire to destroy it (Why the Imperium didn't asked their Navy to do a controlled orbital bombardment on a large target is a mystery (there was only Legio Invicta's carrier fleet in orbit)).
- Bubonis: As its name implies, Bubonis is the Daemonic Plague Titan of Nurgle, which was a special class of Chaos Imperator-class Titan that was fused with a Greater Daemon of Nurgle. Must be a real bitch to take down given the already obscene toughness of Nurgle combined with the ridiculous defense of a Emperor Titan.
- Dies Irae: The most infamous of these monster war machines was the Imperator-class Emperor Titan Dies Irae (literally "Day of Wrath" in High Gothic) which stormed the battlements of the Imperial Palace during the Battle of Terra and had been assigned to to the 63rd Expeditionary Fleet, the Warmaster Horus' own fleet, throughout the Great Crusade. It was eventually destroyed 10,000 standard years later in the 41st Millennium, during an Iron Warriors campaign against the Imperial world of Hydra Cordatus, where the Dies Irae engaged in battle with an entire demi-legion of twelve Imperial Titans, destroying almost all of them before finally being stopped by the Warlord-class Titan Honoris Causa.
- Skylok: A really unusual Chaos Emperor Titan. The Skylok is a Winged Titan of Tzeentch, which was a unique Chaos Imperator-class Titan, that was created through its fusion with a Greater Daemon of Tzeentch. As you can imagine, seeing a flying 50+ meter tall walking cathedral of Tzeentch is not only Awesome but terrifying as well.
The Imperator was one of the two showcase Titans for the Epic expansion Titan Legions, which aimed to take the system back to its Adeptus Titanicus roots of having small numbers of really expensive models battle it out rather than large numbers of dirt-cheap plastic infantry and tanks. Coming in the heyday of the Second Edition "moar rules = bettar" design philosophy, the Imperator came in a box with roughly half a dead forest's worth of cards, counters and rules and featured an insidiously complicated double-sided datacard for the player to perpetrate accountancy on every turn with plasma tokens and garrison troops and a whole load of other shit that made firing a Conversion Beamer in Second Edition seem simple by comparison.
As usual for Titans, the Imperator was roughly 1/700 scale in a system that was largely around 1/350, meaning that it would be hard for even a single Epic-scale Terminator to fit inside the model's head. Since most 40K-scale Imperators are based on scaling up the Epic model without realizing it's half the size it should be, they tend to replicate this. Needless to say, the price was correctly scaled to the Imperator's size in the fluff.
Some neckbeards have tried to kitbash a true 1/48 Imperator titan, and found that at 6'10"/2.1m tall, it would just be easier to make a titan costume and stand on the table.
Above assumes you consider Imperator titans on the higher end of the fluff massive scale, the kind of which you see in things like Dawn of War where humans are mere ants crawling around over the top of it. Games Workshop back in the original incarnation of Apocalypse did a 4000 point datasheet for the Imperator Titan which included a scale comparison with a Warhound and a guardsman, where if you built it, it would be almost three feet tall, so on the smaller end.
The size differences given in the fluff are often to do with varying levels of artistic license, as in the older Titan comic books a normal Warlord Titan was absolutely MASSIVE (despite actually saying it stood over 100 feet tall), but when depicted in the Space Marine video game and running around on a slightly smaller Warlord Titan's shoulders it certainly never gave that impression at all. Though that might have been done to make the game actually run without turning your computer into a ball of chaos daemon hellfire that eats your face with burning teeth before setting your entire city ablaze. Also, different authors can't make up their minds as to how tall Titans really are, with one Imperator Class Titan (the Dies Irae) being described as both 43 meters tall and 140 meters tall in different novels. (43m is 141' 1" so maybe that's what they meant...)
While the classic Epic Imperator had completely fixed armament with no options at all, more recent rules for the Imperator/Warmonger Titan allow it to be armed with a choice of 2 arm weapons and 6 carapace weapons.
Possible carapace weapons are the Laser Blaster, Plasma Destructor, Inferno Gun, Vulcan Mega-Bolter, Gatling Blaster, Melta Cannon, Quake Cannon, Volcano Cannon, Apocalypse Missile launcher and the Vortex Missile.