The Tombs Level III - Spoilers
The old man at 0n/13e is the one of "purest gold" mentioned in one of the hints. Answer "old" and he'll tell you to ask the sage of FANSKAR. 

The Tombs Level III - The Death Snare
Go to the fountain and poison everyone. 
Get the Old Warrior to join the party. 
Fight the Toxic Giant. Give the "Torch!" to the Old Warrior 
Put the Old Warrior at the front of the party and go back to the cloudy face at 10n/3e. The magic door at 10n/9e will open 
