Fire Aspect

Fire Aspect is a weapon enchantment that sets the target on fire.

Usage
Fire Aspect adds 80 fire-ticks (4 seconds of burning) per level to the target. Because the first hit is caused by the item with this enchantment, the first second of fire damage is not recognized. Targets receive and  damage with level I and II respectively.

Formula to calculate the fire damage: fire damage in =.

When a mob that normally drops meat is killed while burning, it drops cooked meat. Experience is dropped only if non-fire damage was dealt by the player within 5 seconds of the death.

Immune mobs
Both Fire Aspect and Flame are nullified on all Nether mobs, except normal skeletons and endermen, because nether mobs are immune to fire and lava.

Fire Aspect