Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Help/Tips/Tricks voidstone and source temple location?

I just killed Cassandra in Phantom Forest.

I am wondering where is the voidstone so I can finally kill those void demons.

Also, is the source temple in the eastern part of the Phantom Forest/Hunter's edge map?

thanks for the help

well, actually killing cassandra makes those void demons vulnerable.

except the death knights...