[quote=@Klomster]And remember, my character is basically a chaos sorcerer, he understands the dangers. The gem is still unusual and interesting.[/quote]

It's mostly just a magic battery, and not even a very big one. Now, if he found Urgrugg's spellbook, that could lead to trouble. Any normal person would just see gibberish... but a ritual-focused, warp insanity driven/guided psyker? Well, he might have a shot at getting actual information out of it, and there are secrets in that thing even Urgrugg leaves be.