What about demons? Not necessarily the big red angry hulk version, but more decent. Like black metal warriors, darkness elementals, succubi.
HEL-LO! I clearly already suggested "David Bowie" and "IRS Audit" as a theme. Pay attention.
However, I would like to add, "The Backrooms"
OOO! What if most DUNGEONS are into Polyandry, but THIS Dungeon is into monogamy?
"Hold it."
The Adventurer looked around, "Huh?"
"Do I smell the Dungeon of a thousand screaming mushrooms, on you?"
The Adventurer looks at the walls, "Wait. Is this the dungeon?"
"Oh My GOD! You DID! YOU SLUTY ADVENTURER!"
[ADVENTURER HAS BEEN EJECTED FROM THE DUNGEON]
So only VIRGIN adventurers can enter the dungeon! There's a theme. The Dungeon goes super easy on first timers, but becomes an absolute DEATH TRAP if you have ever been to a different dungeon.
Call it: The Virgin Adventurer.
Oh god, it writes itself. The Dungeon is out of the way, so very rarely do first timers reach it. It has a reputation for being a death trap, but some local kid who doesn't know any better wanders in. The Dungeon is super easy on the newbie. The Dungeon starts romancing the Newb. Other adventurers look to hire the kid as a guide. The first team listens to him, so they survive. The second team hires him, then betrays him to steal all his equipment.
The Dungeon Gets PISSED.
He suddenly realizes the dungeon is actually super evil. He stomps out. He is about to enter a different dungeon, when he realizes...
I love that dungeon, but when he returns, the Kingdom has decided the dungeon is too dangerous, so they are going to send in an entire ARMY to root out the dungeon core and destroy it once and for all. Adventurer needs to Save the dungeon/
Boy Becomes a cleric. Boy Meets Dungeon. Boy Realizes Dungeon is Horrible soul eating Monstrosity. Dungeon Loses Boy. Boy Realizes he Loves Dungeon. Boy and Dungeon Fight Off The Hero. Boy Gets Dungeon.
Tale As Old As Time...
True as it can be.
Barely even Friends.
His team meets their Ends
Unexpectedly.
Just a little trap
Small to say the least
Both a little scared.
Neither one prepared
Dungeon and the Priest!