By The Trail Of Dead

Speak to Gadin Edson in Three Rivers. Investigate the area he points out and follow the trail of necromancers. - Speak to Gadin Edson - Investigate the Rumors of Necromancy - Speak with Eldor

"On my way here," Investigator Trenkle says, "I met a man in Three Rivers who seemed to hear a lot. He ran an inn there. Speak to Gadin Edson to find out what he knows." "I'll need time to deal with Reggie here, so, follow this as far as you can." - The Bloodaxe Bridge has almost nothing to do with this quest. The necromancers are Across the river, east of Gadin Edson. Eldor is in an encampment with the Kalem sisters off to the right of the road from Themwar's Shield to Tursh. I have also seen Eldor on the road to Renton Keep, so you may have to look around.