From 1d4chan

The Deathstalker is a type of Eldar Super-heavy grav-tank that have never seen the days on tabletop since the ye olde age of Epic. From what we can tell the Deathstalker is armed with a heavier version of the Prism Cannon meaning that it is essentially the Fire Prism on steroids and seeing how OP the Fire Prism was on both tabletop and Dawn of War Emperah help us if Forge World decides to have an update on this beast.

We know of its weaponry due to the very obvious ECKSBOXHUEG crystal situated at the back of the cannon. While this may make the tank unable to have a turret to swivel around for efficient shots as well as having the entire vehicle to move in order to aim. It is compensated for the very obvious firepower this monstrous son of a gun can effectively wield in the heat of an intense engagement or combat.

According to age old fluff, multiple Deathstalkers can combine their fire into a chain to produce a much more powerful blast, meaning that this thing has the potential to turn your Titan legions into slag of molten metal

Forces of the Eldar
Heroes: Eldrad Ulthran - Illic Nightspear - Prince Yriel - Phoenix Lords
Command: Autarch - Avatar of Khaine - Exarch - Yncarne
Farseer - Seer Council - Spiritseer - Warlock
Troops: Bonesingers - Guardians - Rangers - Storm Guardians
Aspect Warriors: Crimson Hunters - Dark Reapers - Dire Avengers - Fire Dragons - Howling Banshees
Shadow Spectres - Shining Spears - Striking Scorpions - Warp Spiders - Swooping Hawks
Exodites: Dragon Knights - Eldar Knight
Structures: Webway Gate
Wraiths: Wraithblades - Wraithguard - Wraithknight - Wraithlord - Wraithseer
Support: Support Weapon Battery - Vyper - War Walker - Wasp Assault Walker - Windrider Jetbikes
Vehicles: Hornet - Falcon - Fire Prism - Firestorm - Night Spinner - Warp Hunter - Wave Serpent
Flyers: Hemlock Wraithfighter - Nightwing Interceptor - Nightshade Interceptor
Vampire Hunter - Vampire Raider - Void Dragon Phoenix
Deathstalker - Cobra - Lynx - Phoenix - Scorpion
Storm Serpent - Tempest - Void Spinner
Titans: Revenant Scout Titan - Phantom Battle Titan - Warlock Titan
Spacecraft: Darkstar Fighter - Eagle Bomber
Auxiliaries: Harlequins