[Lava]

It's not all for the same quest. The human skeleton is for a quest in Baldur's Gate city.

For Ormyrrs, I think you also needed a special crown that belongs to the Psychopath from Gnoll Stronghold. It's all in the journal entry to be honest:

Ormyrrs' Peak

I met two dead ormyrrs that... well... talked to me. They'd like me to find a star sapphire, some dark crown one of them lost nearby, the ring of princes, an amulet of protection, and golden teeth. A weird list. Then, I should place those on them in a specific way.