The Water Arrow:

The water arrow is extremely useful in most situations. The water arrow is used to extinguish torches, thereby reducing the amount of ambient light in the area. The water arrow is also essential when fighting the Undead. Holy water, when combined with water arrows, often makes short work of Undead. Lastly, legends say that water is a weakness of Fire Elementals, a fact worth knowing for the unwary Keeper who finds himself in the presence of an elemental.