From 1d4chan
That's a nice Titan you got there, its head is going up on my trophy wall.

The Ravager is a Heavy Support variant built upon the Raider chassis and used by the Dark Eldar and more specifically with space normally reserved for Kabal members filled up with two additional sponsons. The changes made can be seen with the mounting of three devastatingly powerful heavy weapons. Upon the battlefield it fulfills the role of armored fire support, engaging the heaviest of enemy targets, though in comparison to one of the Imperium's tanks, it is akin to a swift-winged raptor to a lumbering beast of burden although its armor is still dirt poor in comparison. Like all vehicles from the DE, the Ravager replaces defensive armoring for speed and are so fast and maneuverable that they can ambush an enemy tank and destroy it in a single devastating pass, disappearing again before the enemy knows what hit them.

The targeting arrays of a Ravager are outfitted with as much information about their quarry as their Kabal can muster, and each grav-skiff's crew briefed as to the best way to annihilate the enemy vehicle in question. This means that the Ravager's gunners can focus on blowing up your precious Land Raider with a few shots while getting away with a smiling grin. Once this task is achieved the Ravager's crew have a carte blanche to swoop around the battlefield, wrecking as much shit as possible before either fleeing the battle or falling apart due to their wet-tissue armor.

During a planetary raid, a Ravager squadron is fully capable of appearing from nowhere, delivering the death blow to even a Titan of the Adeptus Mechanicus in a single volley, and then disappearing over the horizon before the behemoth has even toppled to the ground. How the hell can they fell a mighty Titan you may ask? Well its because the Ravagers are equipped with three heavy weapons, usually Dark Lances or Disintegrator Cannons which means you can kiss your hardened ceramite plates goodbye. Ravagers may also be equipped with special upgrades, like the Horrorfex, Night Shield, Screaming Jets and Scythes.

Forces of the Dark Eldar
Command: Archons - Haemonculi - Kabalite Trueborn
Lhamaeans - Medusae - Sslyth - Succubi
Troops: Beastmasters - Commorragh Slaves - Grotesques
Hellions - Incubi - Kabalite Warriors - Mandrakes
Scourges - Wracks - Wyches
Beasts: Clawed Fiend - Khymerae - Razorwing Flock - Ur-Ghul
Pain Engines: Cronos Parasite Engines - Talos Pain Engines
Vehicles: Raider - Ravager - Reaper - Reaver Jetbike - Venom
Flyers: Raven Fighter - Razorwing Jetfighter
Voidraven Bomber
Spacecraft: Impaler Assault Module - Raptor Fighter
Slavebringer Assault Boat
Super Heavies: Tantalus
Auxiliaries: Harlequins