If a villain captures an artifact, I read in the rules that it is discarded. But then I read also in the rules, that it is placed off to the side of the board to show that they have it in their possession. Are you playing with or without an active vile organization?
The Mob boss villain has Ambition, which gives him +1 die to combat for each artifact they have in their possession.
So I am really not sure if they keep the cards, or if the artifact is only kept if it is a temple artifact?