Dark Angels is the third expansion for Space Hulk: Ascension, which is based on the Games Workshop board game set in its Warhammer 40K universe. Here's what players can expect from Dark Angels: 
Featuring over 25 hours of content, Space Hulk: Ascension - Dark Angels continues to add incredible features and value to the turn-based strategy game. Written by Black Library author Graeme Lyon, the story campaign "Bringer of Sorrow" sees the planet Corinthe under attack by Tyranid forces, with a newly emerged Space Hulk that has to be eliminated by the Deathwing. Plasma Cannons shoot out huge fireballs of glowing plasma that splash across large areas, causing insane amounts of damage. 
They can be overcharged for additional splash damage. The Apothecary is a support class that complements players command slot in their squad, and bolsters the resolve of nearby Terminators and supports defensive play styles. 
Developer Full Control, based in Copenhagen, Denmark, first released Space Hulk: Ascension in 2013. It recently announced that the game would be the last new project from the studio, although it will continue to support Space Hulk: Ascension 
Set in the isolated corridors and tomb-like chambers of ancient vessels
lost in the graveyard of space, players lead a small force of fearless
Space Marine Terminators in a ferocious fight for survival against
hordes of predatory, alien Genestealers
The standalone sequel to Space Hulk brings an all new and improved
single-player experience for the turn-based strategy game
The Dark Angels!
This expansion also adds a new campaign playable for all existing
chapters
Playable Dark Angels Chapter
Plasma Cannon weapon option
Exclusive Apothecary class
3 new psychic spells
Bringer of Sorrow Campaign with 20 New Story Missions and 20 Flash
Missions
This expansion is made standalone, and has all previous released DLC
content included and game is updated to lastest version.
For people who do not know this game i posted an article before with pics and videos. ENJOY!!