Not sure if this is intentional, but the Ogres (Lump, Fank, Chock) seemingly hate the Tieflings in the Druid Grove and proceeded to kill all the friendlies on top of the Ramparts when summoned. After the fight with the goblins they walked down the hill and killed the Quest NPC I was supposed to talk to, Cerys. Eventually, some Tieflings who didn't feel like fighting goblins came out of the woodwork and killed the Ogres, but everyone who was Zevlor and Cerys are dead.
Funny, but a bummer considered the fight took me 30 minutes :P