OK...so I went and cleared Yaisog's joint, found the emissary, went and killed all the eyegougers, headed back to old owl well....encountered some guys along the way that said something about not letting the emissary get through...killed them all, continued to the well and now no emissary to be found....Callum still tells me to go find him...tried retracing my steps, but now he is nowhere to be found....did I miss something in that encounter? if so, how can I get back to it?

Do you think that he died in the attack?

Noconos:
OK...so I went and cleared Yaisog's joint, found the emissary, went and killed all the eyegougers, headed back to old owl well....encountered some guys along the way that said something about not letting the emissary get through...killed them all, continued to the well and now no emissary to be found....Callum still tells me to go find him...tried retracing my steps, but now he is nowhere to be found....did I miss something in that encounter? if so, how can I get back to it?

He is further down the cave where you kill Logram and there should be loads of undeads there aswell as a new shadow priest :) There all setteled