Ultima VI: The False Prophet/Pirate Cave

Dungeon walkthrough
The inscription on the tomb reads: "Here lies Captain Hawkins. He died a hard death and he deserved it". Examine (Look) the bones and collect some items.
 * Floor 1

Beware of narrow passages: use a purple potion (protection) on one character and send him solo scouting for any trap. The first sign is wrong, the following ones are trustworthy. Therefore, avoid "jumping to your death".

At the fork, go north then all the way east until you get to the ladder: this is a detour that allows to obtain an invisibility ring.

The subsequent useful ladder is all the way west. Any other ladder leads to an islet in the middle of a subterranean lake. From the north ladder, just go all the way east, then up the ladders. Beware of bear traps as before, then collect the ring.
 * Floor 2 detour

The rest of the "floor 2 detour" has no useful items. You can see what would have happened if you "jumped to your death": a lava pit with dragons. tThe westmost ladder from floor 1 leads to an islet connected to the mainland by a bridge. There is a passage to the south-west. A sign reads: "The maze of death". There are no traps, though. Hug one wall and you should soon find the only ladder down. The sign reads: ""Off limits". As on floor 1, any hole leads to a lava pit. The only exception is the hole with a gold nugget nearby.
 * Floor 2
 * Floor 3

The ladders down are actually the exit from the lava pit traps. Not only that, such area is infested by invisible demons. After a long but featureless tunnel, you will get to an area with three poison fields. Ignore the first ones and the last ones: you can walk around them. Dispel the second field to reach the treasure of the pirates. Blast the door with an explosion spell and loot all the treasure.
 * Floor 4

Summary
You can definitely bring back the storm cloak to Homer: you already own two, plus the lv.6 "Negate Magic" spell.