The furnace is out of heat but the lever itself burned my hand when I grabbed it. It must have been cursed by those ghastly hexfiends. It's what they do. What I do is kill fiends. Ghastly hex versions are now at the top of my list...
Repeatable
Slay undead.
Seek revenge on ghastly hexfiends (in High Keep: The Bloodless Incursion)
Quest Rewards above are only the guaranteed XP, faction, and coin rewarded for this quest. Status points and rewards limited by class, race, alignment, etc. are unavailable.