Itombu was a shadow demon that lived in the screaming jungle. When the PC’s found him, he has possessed a dire ape. They knew something was wrong and became angry at the gods when their spells that should have worked on such a beast were resisted.
When, the ape was killed, Itombu came out and fought full on. Before he was killed Itombu dropped Jari, possessed Skank, and Old Balls ran away. It was with this fight in particular that the PC’s realized that perhaps they had not put together a top tier group of adventurers, as Itombu was only killed because he possessed Skank who had the monkey fetish causing it to automatically banish him.
Prior to that, the party was on its way to being wiped out.