Ok so I'm playing the solo game and I've come across this problem.
The rules state that once a villian recovers an artifact, the artifact and adventure card is discarded.
If you raid a base, you can steal an artifact.
How is this possible if you discard the artifact?
I thought the same exact thing after reading those two parts of the rulebook for villains! It took me a few re-reads before I realized the [correct] way of thinking that Matt (mvettemagred, above) points out.
It's worded weirdly - probably because it's a new paragraph so it seems like it's talking about a new subject - until you realize that it's STILL (and ONLY) talking about the end of a temple artifact adventure.