"So this lich is giving us a guided tour of the most dangerous dungeon in this world?"
[Mild Curse of Strahd spoilers]
So our party is investigating the Amber Temple in Barovia, when our chaotic good (emphasis on the former, as the latter changes at the end of this story) cleric Rokas accidentally discovers a lich who has lost his memories. She fails her roll to know what a lich is.
DM: So yeah, you basically just think this skeleton dude is pretty chill.
Rokas: I’m gonna cast Greater Restoration on the lich
The lich regains his memories and is super grateful to us for helping him, so when we ask about the weird voices we had all heard (which we found were the temples evil spirits reaching out to us), he volunteered to show us all the tombs
DM: you know… I really see no reason why he wouldn’t show you all the treasure, too.
We ended up getting ALL the loot from the temple, and three of the four of us (including the cleric) ended up making deals with the evil spirits. This included our wizard making a deal to become a vampire - he just had to kill someone who revered him and be killed by someone who hated him.