[Cerek the Barbaric]

I've almost completed SoA. I finished everything in Suldenesselar and went back to clear out Watcher's Keep before tackling Irenicus.

Thats's when I realized I was almost at the end of the game and still haven't found the last two heads for the Flail of Ages. I read the locations in a Walkthrough waaaaaay back when I first started the game, but that site now requires a membership and I can not remember where to look for the last two flail heads.

Please help.