Building 10 rooms

SNOW FUNGUS:        PLANT
BLESSED SALAMANDER: MONSTER
TITANIC SCARAB: VERMIN
BONE ZOMBIE: HUMANOID
BLACK WARLOCK: BOSS
LOBE EEL: CRITTER

F
| |
E
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I--D
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G--C
| | | |
H--B--A
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J
Room A.
SMELL: Meaty reek of underworld flowers, like frying fat and potpourri.
Pool of stagnant water with treasure chest at bottom. Treasure chest contains bound, gagged MOTHONIA the RHYMING CLOWN, is temporarily watertight. If released MOTHONIA the RHYMING CLOWN will demand vengeance on BONE ZOMBIE in room C, offer reward for assistance in this matter.
Room B.
Looks like three-doored room. Tarnished mirror in corner will, if cleaned, show secret fourth exit in reflection. If taken to any other room it will also show a secret extra exit in that room. Secret extra exit always goes to same place, no matter where you are in the world. Overuse has chance of awakening evil reflection monsters.
Room C.
SIGHT: Immense limestone stalactites hang from ceiling.
Panicky BONE ZOMBIE wearing obviously-stolen BELT OF FORCE caught at fork in road, not sure which way to go. In one round TETHWOMP the EMACIATED ASSASSIN, conspicuously missing BELT OF FORCE, will emerge on scene and demand it back.
Room D.
SIGHT: Flowers bloom everywhere, even where they shouldn't. Especially where they shouldn't.
Floor of cave is shoulder-high thicket of SNOW FUNGUSS. Exits raised. Stones protruding from top of thicket let you jump across. SNOW FUNGUSs carnivorous, LOBE EELs in symbiotic relationship w/ them will attack when you are halfway across.
Room E.
Bunch of BONE ZOMBIEs quivering in fear as you approach. BLESSED SALAMANDER followed you in, is directly behind you.
Room F.
SOUND: Howling laughter, swiftly fades to nothing.
Space is bent in such a way that walking down this tunnel will bring you out in room C.
Room G.
Enormous pile of DECK OF THE GOATs, all exactly alike, dumped haphazardly in corner. Only one is real. The rest are clever fakes that have a 25% chance of working once and then break. Somewhere in room C is concealed the secret of finding the real one. Possibly in someone's brain.
Room H.
Single enormous carnivorous SNOW FUNGUS that is secretly intelligent and the mastermind behind everything that happens in this dungeon.
Room I.
LOPPOMPA the OBESE PLAYWRIGHT attempting to domesticate LOBE EEL, with limited success. Has been reliably informed that LOBE EEL's favourite food is SNOW FUNGUS, will pay semi-handsomely for samples.
Room J.
Looks like empty room. Actually maw of cave leviathan, those weird stalagmites its teeth. Glimmer of treasure deep in gullet is pyrite lure. LOBE EELs pick dead flesh from between teeth.