After the millenium passed, the Grey Knights chapter was wiped out from the forrest moon base by a Daemon Xolathor. This was forseen by the Farseer´s of the Lost Vyper -craftworld. This was the opening they needed. An Avatar was woken to lead the strike force, to gain the control of the base, once and for all...

Primary : Objectives
Secondary : Modified Maelstrom
Tertiary : First Blood, Slay the Warlord, Line Breaker, Last Laugh

[url]http://youtu.be/ANq6Fq0zImo[/url]