Bombardier beetle

Useful Info

Bombardier beetles are insects that can set you on fire. They can be found in the early Dungeon.

Bombardier beetles are what teach new adventurers how Sticky Flame works. 2d3 fire damage per turn doesn't look that bad on paper, but that damage ignores AC; even heavily-armored characters will take significant damage. However, moving around will reduce the duration of the effect -- if you're set ablaze, keep moving to shake the flames off.
Bombardier beetles' Pyre Arrow is a natural ability, so you can't use silence or antimagic to prevent them from casting.
They are slow, so it is easy to retreat if you can't fight one yet.
They are vulnerable to poison, so kiting one around while throwing poisoned darts at a distance is a good way to avoid ever getting hit. Even at 0 skill, two successful darts will usually apply enough poison to kill one.