There, I've given the potential Golem character a possible entry. It does not need to be taken, but I thought I'd leave the opportunity available. 

Basically, Jazeer is in the central chamber of the sewer systems, led there by his goblin companion Jakig. There was supposed to be a goblin encampment there, but now it is occupied by something else. Perhaps the goblins did something? Or maybe the wars above have weakened an old seal? 

Like I say, optional.