Vanir, a Devil King General!

They entered the room cautiously to find a man of slender build, crafting one of the dolls. And he looked exactly like said dolls, only bigger, and of course, not being a doll, more like a person the dolls were modeled after, and he was wearing the same mask as all of them. "Hmmm?" he blinked, looking up from his handiwork. He then brightened up. "Well well! Welcome to my dungeon, brave adventurers!" the man got up, giving them a polite bow. "I am a general of the Devil King, and the Duke of Hell who commands devils! I am the Great Devil, the one who sees all in this world, Vanir!"

"A Devil King General!?" Darkness, Kazuma and Cremea responded at once, getting ready to fight.

"Calm yourselves. I have no desire to fight any of you," Vanir held a hand up. "Our dear king asked me to investigate why Beldia abandoned his mission to investigate this town, and is Eris only knows where in this world. He's rather unhappy with that Dullahan. Great fighter he may be, but sharpest knife in the drawer, he is quite far from. I just hope I'm able to be there to see Beldia return to the king's castle, I'd pay to see the verbal thrashing he's in for. Of course, I'm also here to see a certain hapless shop keeper who can't seem to stop losing money. Regardless, beyond running simple errands, and maintaining the barrier, I'm a rather lackadaisical general. I've never seriously harmed a human directly."

"...then, what's with the dolls?" Kazuma asked warily. "They're coming out of the dungeon and causing all sorts of trouble."

"Oh? Wonderful news!" Vanir brightened up. "When I decided to claim this dungeon, I noticed a lot of monsters that didn't strike my fancy, so I simply made all of these dolls and sent them out to clear the dungeon! If they're reaching the surface, then that means the dungeon is clear! It's now mine to remake as I see fit!"

"What do you want with the dungeon anyway?" Kazuma asked.

"Calm down young man who can't keep a blade intact to save his life," Vanir remarked.

"...what?" Kazuma asked, blinking, before remembering he still had his currently broken sword, so wrote off that comment to be referring to that.

"To answer your question though, we devils feast on the animosity you humans find so unpleasant. So I wish to make a grand exit after enjoying the greatest ill will you can muster towards me," Vanir continued. "So I decided to play a grand trick! First, I would make a dungeon, then, I would station powerful minions and traps in every room! Many adventurers will enter to challenge it with the promise of a grand reward! Eventually, one group shall reach me, and after a fierce battle, I shall fall. And once I do, a treasure chest will appear, and they will open it to see their reward for all the hardship... Only to find a note that reads, "you lose." And as they digest this, and grow enraged, I shall meet my end, enjoying the last laugh!" Vanir cackled.

"...he intends to make his own death into a big prank?" Ria mused as Kazuma, Darkness and Cremea stared in disbelief at Vanir. "...I LIKE this guy!" she grinned.