From what I've dealt with, with HOURS of trying this challenge...

There's the Foul Lair - with chickens & a pig, full of treasure
The Veiled Treasure dungeon full of chests
Vile Swarms
Shower of Gold
Ancient Urn
Resplendent Chest
A Yellow Mob (mine were the big golem like things)
A Puple Mob (again, mine were the big golem things)

Still waiting on the diseased bodies, and the final one, whatever that is... A mob of skeletons?

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Wait, sorry - my mistake...

A few minutes after posting, I actually had the ancient artifact spawn (probably) about 8 out of 10 attempts... Unfortunately, only 1 of them was one of the 3 I needed..

So its as above, however, there is a resplendant chest, a standard chest, an urn, gold, the vile swarms, the golem like monster things, the 2 vaults (veiled treasure and fowl lair) and I assume the final 2 are the skeletons and diseased bodies...

If only I got those 2 instead of the swarms - seem to get those almost every time now...