Journey

He has a lot of good artifacts, so I put a ban on it.

But why the ban? We need to reward people for working hard and killing the Lich!

Added 2 minutes later

There's always a chance to steal artifacts BEFORE the Lich even appears in the tomb.

Well, if you have a portal spell to the city, you can, but otherwise, he outruns me with clever logistics and boots, even if I don't pick up the artifacts.