It is in Oasis, about 139 steps south-west of the spot the map marks with that name.

And 8 down from the surface once you are there.

• 1 — Oasis, as the map itself names it
• 2 — the ground above the treasure

• Level 75 at least — there is a level door on the way in.
• A rope. You drop in through a hole, and a rope is how you climb back out.
• Something for demon, warlock and Rahemos — they live down there.

The chest is 8 floors under the surface. Going down over it, this is what each floor uses:

1. Ground: down through a ladder.
2. 1 down: down through a hole.
3. 2 down: down through a hole.
4. 3 down: down through stairs.
5. 5 down: down through stairs.

• 1 — the way in: a ladder, ground
• → — the treasure lies this way

• 2 — a hole, 1 down
• → — the treasure lies this way

• 3 — a hole, 2 down
• → — the treasure lies this way

• 4 — stairs, 3 down
• → — the treasure lies this way

• 5 — stairs, 5 down
• → — the treasure lies this way

Some floors are not on the list: their way down is further off than the rest, and that stretch you have to find yourself.

• 1 — the chest
• 2 — the chest
• 3 — the chest
• 4 — the chest
• 5 — a tile to step on
• 6 — a tile to step on
• 7 — a tile to step on
• 8 — a tile to step on
• 9 — a tile to step on
• 10 — a tile to step on

The strongest 14 of 46 kinds whose nests reach this place.

There are 7 chests here under 7 quest numbers, so you can take them all.