The Flaming Skull

The DEVIL+D adventuring party found and fought an undead floating flaming skull in Wave Echo Caves ... and then they had to fight it again ... and again.

The Flaming Skull kept reanimating itself in the caves. The party had to figure out how to permanently destroy it, and went to ask Mormesk. They found out they needed holy water, or access to the 'dispel magic' or 'remove curse' spell, which none of them had the ability to do without resting.