"In Lir's original report, he mentioned witnessing a raid on one of the Elders' fuel processing facilities, commonly called the South Tower. It was a bloodbath, and apparently no Elders survived, except for Lir. The raid was carried out by a Lieutenant Doomish, one of the Great Evil's minions. We should check out the South Tower and see if Doomish is still there. If he is, you'll need to assassinate him."
Leave Nichol's house and follow your compass to the South Tower. To get inside, fly up to the bridge connecting the towers, and follow it to the entrance. Head down the spiral staircase to the bottom of the tower and locate Lieutenant Doomish. Once you have killed him, return to /warp chapter2.