Originally posted by Nefrarya:

Withered bones are needed for the third boss (in the swamp), but you need to beat the second boss (in the forest) to get the key for exploring the swamp.

I did already and no key was given.
Strange will go do it again and see whats up with that.
Maybe I just overlooked the drop from the 2nd boss.

Thanks for the info and will now go and look.