Nemesis

Nemesis Chapter
Founding	Second Founding
Successors of	Ultramarines
Chapter Master	Unknown
Homeworld	Unknown
Strength	Unknown
Specialty	Unknown(probably Exterminatus)
Allegiance	Imperium of Man
Colours	Dark Green with Red-Orange Accents.

The Nemesis Chapter. Now that's a kickass name. Cool factor turned up to 11. Probably the only chapter with a name cooler than the mother fuckin' ass blasting Destroyers. Anyways. What happens when you take a company of Devastator Marines during the Great Crusade from a generic Legion and have them work with the Night Lords? You get the Nemesis Chapter. These guys have the potential to be awesome, if it weren't for the spot-light being cast on others at the moment. Anyways, the Nemesis Chapter was originally the 22nd Co. of the Ultramarine Legion. During the Great Crusade, the Legions had special Devastator units known as Destroyer Squads, whose main weaponry was considered "too cruel" to use on other living creatures even by the low standards of 40k. This meant that these guys used the most destructive weaponry that the Imperium could pull out at the time, with shit like rad missiles (if they didn't blow you up on the spot, you'd still die of space cancer) and phosphex grenades being the norm for them. Since such work wasn't used all the time, they were relegated to sitting back and waiting till their commanders said "Fuck it, nuke everything." Oddly, these guys wound up working with the VIIIth Legion during this time and became quite good at blowing up planets. Eventually, the 22nd Co. started to dress up like the Night Lords, but Roboute Guilliman put a stop to that. Once the Heresy broke out, the 22nd Co. stayed true to their root and remained loyalist. After the Heresy, they were made into their own Chapter as a part of the Second Founding. They still retain their dark history with a skull as their insignia.

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  If their weapons won't kill you, their color scheme will.