I finished this today, 3rd try with this character. Never had this trouble before, with any character. But, today, got stuck twice. Tonn wouldn't move at 2nd tower. I followed line 1. Kill EVERYTHING before talking to Tonn at all.The spiders in the cave spawn again after leaving the second tower.I ressed three at the 3rd tower.I skipped the cut scenes.But I killed EVERY mob I could find, first.And after the 2nd tower, I followed the pack and Tonn followed me. Good enough. Thanks to all who posted the workarounds for this problem.