Building 7 rooms

CAVE ORCHID:   PLANT
TRUE BASILISK: MONSTER
MAN-SCARAB: VERMIN
HOOK KOBOLD: HUMANOID
SORROW WRAITH: BOSS
SIEGE GOAT: CRITTER

B--A--D--E
| | | |
F--C G
Room A.
Big wooden door halfway along corridor locked as fuck. Key in possession of HOOK KOBOLD in room F.
Room B.
SMELL: Spoiled-sweet, like garbage.
SIGHT: Immense limestone stalactites hang from ceiling.
Space-distorting statue in exactly-square corner of corridor. Shaking right hand will increase number of corners until corridor is mile-long side of polygon. Shaking left hand will decrease it again.
Room C.
SMELL: Vomit.
SOUND: Coins clinking.
Waterfall that trickles in through crack in wall, disappears in swirling vortex into crack in earth. Tricky climb, must be made to pass room. SIEGE GOAT den hidden in cave behind waterfall, half-digested ELIXIR OF THE PIT in stomach of sleeping SIEGE GOAT.
Room D.
HOOK KOBOLD on a banjo, playing the Humanoid Blues.
Room E.
SMELL: Dry and musty, like mummy wrappings and black mold.
Enormous mirror is scrying-portal to alternate realms. SORROW WRAITH getting stern lecture from overboss in Plane of Chaos/other, better dungeon/Hell, will shortly emerge in extremely foul mood. If there is a mirror anywhere else in the dungeon this mirror will let you look out of it.
Room F.
SORROW WRAITH lowering itself to play dice w/ HOOK KOBOLD retainers. Will pretend it's condescending to let you live so long as you amuse it by joining in. Actually, not totally sure it can take you, not really in fighting mood, will throw game and say you've earned your freedom. Has STONE OF THE DAMNED, might be convinced to wager it if stakes high enough.
Room G.
SIEGE GOAT den. Where they keep their babies. Parents not pleased to see you.