1 - Green Gem Vein, B Key
The vein does regenerate green gems over time. Good way to make some extra money if you still need it.
This is where the key dropped from upstairs. Use this key again in the boiler room at 27.

2 - Dru Tan Boss
This boss is tough. Its hard to kill and does alot of damage. The easiest way to deal with him is cast a bunch of guard/attack minions and let them do the work. Beware of his poison clouds.
Drops: Blood Key

3 - Green Gem Vein.

4 - Emerald Orb

5 - Blood Keyhole
Opens the door for the rockmen. They light the furnace for you. They are not agressive unless you attack them.

6 - Trap
Once you step on this pressureplate wooden pikes will come your way and kill you. Press the secret button near the door to get out.

7 - Secret button
Activates teleporter at 8.

8 - Teleporter
Created when pressing the secret button at 7.
Teleports you up to the Furnace level.

9 - Kalan Gauntlet

10 - Stormring
Move the boulder to get to it.

11 - Blue Gem Vein
Note: The flames that spawn in this area can kill you. Don't let them come close. Cast a Weaken Non Material beings (Des Ew) spell for the easiest kill.

12 - Axe

13 - Gold Coin