knome concept suggestions?

[Deremir]

basically i have this idea for an adventure and i wanted to see if anyone had any suggestions to make it more interesting

i got the originall concept from overlordII i figured the players would find this hole in the ground that very steryotypical knomes would start poping out of, they would be 1 ft tall(with another ft of pointy hat) and obviously tiny sized, they would have no sense of self preservation, and thus would volunteer to be loded into catapults and lit on fire in order to attack invaders(the pcs) also i thaught it would be funny if whenever they got lit on fire they would run about histerically and then explode, dealing 1d6 fire damage. the only meele weapons they would use would be (tiny)dagers. the knomes would have a king who wears a gold pointy hat, if the king is killed the knomes scrample and whoever puts it on first becomes the new king

i figured to make sure the players go into the knomes hole i would have the knomes steal a key or something.

inside the hole it would just be a tunnel system/dungeon

so what do you think? any suggestions for improvements?