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-Is their any fluff on these guys at all

-What have they invented so far for the forces of chaos?

Im looking for a few ideas for my custom warband

There's some good stuff on the Dark Mechanicus in Dead Sky, Black Sun.

Scorpionov wrote:-Is their any fluff on these guys at all

Not very much. They were led by the Fabricator General himself during the Horus Heresy and fled into the Eye of Terror with the CSM afterwards. They run a Forgeworld in the Eye known as Xana II that produces all kinds of Daemon Engines. The world itself is supposed to be a giant hellish factory world manned by countless slaves and the Dark Mechanicus Tech Priests running it will sell their creations to the highest bidder, having no scruples whatsoever. They're also described as being a fusion of Daemon and machine themselves.

-What have they invented so far for the forces of chaos?

Hell Blade & Hell Talon fighters. Harbringer Bomber. Defilers. Lots of other Daemon Engines. They also operate the Traitor Titan Legions.

They created Abaddon's Planet Killer.

They've done alot, i remember in the Grey Knights Book they fought the lord of all titans which they killed.

Based on what i've read from the novel Titanicus, they seem to be a more demented and insane version of the normal mechanicus guys, even their titans give off a non-sensical code that the normal mechanicus can't understand

Unlike their imperial brethren they actualy inovate. Often trough the combination of science with warpcraft.
Notable inventions are the Hellblade/Helltalon fighter as well as the Defiler and the powerful Idolator class raider.
In all likelyhood Subjugator class titans ( a slaaneshi titan ) as well as stalker tanks and all manners of warp infused tech can be tracted back to them.

If the dark mechanicus ever gain as much resources and forgeworlds as their imperial counterparts, the IoM might be in trouble

The 2nd book of the gray knights trilogy takes place on a forge world that has been stuck in the warp for 10,000 years (not in real time), and has been converted to the dark mechanus. Lots of fluff about them in that book. Good read as well (but the 3rd one is better)

They are just adepts that were seduced by Chaos

SOme info avialable in Dark Adeptus and in Mechanicum.