Retrieve the Smelter from the Arcanium mine Overlord Guide

Go for the job then - enter (#1) and you are - in Arcanium Mine. First thing you'll see: the smelter (there's a brown spawning pit too), but don't be hasty - do your business first and prepare a way to take the object back to tower. So, take the path right (#2) and, as usual, kill the dwarves and break some stuff. You'll find red and green spawning pits as well.

Now you can go down there to get rid of the slugs (#1) and cover their hole. Kill the big mama slug too while you're there. Equally, you can take the path left from the entrance toward the furnace and then down. You'll meet two dwarves with fireblasters there (#2) - so take care of them but be careful. Remember that they are explosive. Walk up the ramp to your right - there's blue spawning pit and stairs. Walk down the stairs - to flip the lever so the flames stop coming out of the furnace.

Go past the holes - leave the smelter for now - up the ramp and then down from the other side. Turn left and you'll see red spawning pit (#1) and some fiery bugs. Continue around the path killing the bugs and you'll find another spell. Let minions take it and follow them as they carry it the waypoint - they'll stop before a lava stream. Go up the stairs and flip the lever (#2). After a few steps they'll stop again so flip another lever and now they'll walk okay. Well done! Now let's go back and do the same with the smelter. There's also some gold by the levers, somewhat further, so send 7 minions to get it. When you're finished with the job here, go to your tower, visit your mistress and fry yourself some fancy armory. A new piece of clothing will make a tasty final touch - just for a new quest!