There's a new Chaos Space Marine codex coming soon for 40k. Inside, there's a whole host of hosted weapons. That is to say, the weapons are host to a daemon. Get a look at these new daemonic weapons in this preview.
From the article:
One of the best things about dooming your fellow humans to an eternity of torture at the hands of thirsting gods is the awesome gear you pick up along the way. The eightfold path to ascension is littered with powerful weapons for cracking mortal skulls – and the most dangerous of these are more than mere blades and bludgeons. They’re inhabited by malevolent warp entities, who want nothing more than to be your new best friend. Probably.
And in the upcoming Codex: Chaos Space Marines, this daemonic armoury will grant your champions power, glory, or maybe just an unfortunate end.