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I've read somewhere that the Dark Angels chapter has some special bond with certain Forge Worlds for producing some of their exclusive technology (such as the Nephilim Jetfighter and the Land Speeder Vengeance). Has it ever been said which exact Forge Worlds were involved? Main reason I'm curious is because when I get my Imperial Knight built, I want him to have markings of both the Adeptus Mechanicus and the Dark Angels, but I want the Mechanicus markings to make sense. Obviously if it hasn't been said, I'll just make up my own fluff and color scheme for the Knight in question. I'm largely going to have to do that anyway, but I thought I'd ask people with more knowledge of the fluff first.

I'm looking for somewhat of the same thing actually, only I'm looking for a 30k Forge World allied with the Dark Angels. The only possible link I've found so far is the Forge World of Diamat, reclaimed for the loyalists early on in the Heresy by Lion El'Jonson himself, although the 'loyal' Magos was actually a traitor that took over the complex from the real loyalist Magos. My reasoning is that either Diamat then had a tie to the Legion, so that they may later have assisted them in manufacturing needs.

In case you wanted to know, I've found a way to run every single army list so far (except Mechanicum, although I'm close there too) and have it be entirely fluffy, meaning Guard Regiments (Calibanite Jaegers, in Fallen Angels and Master of the First), Knight Houses (House Vyronii, Book 4- Retribution), and Titan Legions (Legio Ignatum, the Fire Wasps, in Descent of Angels)

DA never been on good terms with the Mechanicus. Since they withhold their STC. Making it probable that they build them themselves.

You could just go for the Three Witnesses. Freeblades that pledged themselves to the Chapter.
One is the Crucible of Wrath, originally a Mechanicus aligned house, would fit perfectly.

http://wh40k.lexicanum.com/wiki/Crucible_of_Wrath

The second one is from House Drakkus from the Freeblade Mobile game.

https://www.games-workshop.com/resources/catalog/product/600x620/99020108017_HouseDrakkasFreebladeBundle01.jpg

Didn't find the third one yet.

For 40k going with the Three Witnesses would probably be the most fluffy (and awesome) way to include some Knights in an DA army, because the DA are not really known for being on good terms with the AdMech (or with anyone except their own really, being all secretive and selfish doesn't get you much friends).
For 30k any Forgeworld or Knight World liberated by the DA is going to work.