Brogue Wiki
The spike on each of these darts is designed to pin it to its target while the unstable compounds strapped to its length burst into brilliant flames.

Incendiary darts are a ranged weapon. They deal 1-2 (average 1.5) damage and have a strength requirement of 12. Incendiary darts will set creatures and flammable terrain on fire. They can be used to kill hard to beat enemies (such as vampire bats in the early game), to burn down wooden barricades, or to set flammable gases on fire.

Swords: Dagger · Sword · Broadsword — Axes: Axe · War Axe

Polearms: Spear · War Pike — Maces: Mace · War Hammer
Misc: Rapier · Whip · Flail
Ranged: Darts · Incendiary Darts · Javelins