Onyx bolts (e)

Enchanted onyx bolts are rune bolts tipped with enchanted onyx. Onyx bolts can be enchanted through the spell Enchant Crossbow Bolt (Onyx) by a player with level 87 Magic. The spell enchants 10 onyx bolts at a time.

Enchanted onyx bolts are enchanted with the Life Leech enchantment. This gives the bolts a chance of doing extra damage and healing a small amount of the attacker's Hitpoints. This does not work on undead, as they have no life to leech.