Fire Arrows
From The DarkMod Wiki
Fire arrows cause a significant explosion that will fling movable objects around. It makes a massive amount of noise, so use it only when you're not worried about being caught.
Tactics and strategies
Fire arrows will cause flamable objects, like unlit torches or candles, to ignite.
Gameplay considerations
Having a fire arrow selected as your current weapon makes you very easy to see.
In-game description
Fire arrow: Used primarily by elite mercenaries, these will explode violently on impact. The tip glows and is easily seen in the dark.