Emerald bolts (e)
From Emps-World Wiki
Emerald bolts (e) can be created by tipping Mithril bolts with Emerald bolt tips and then enchanting them with the Lvl-3 Enchant spell from your Normal spellbook.
These bolts have a 20% chance on hit to poison your target with 10 damage for each turn.
They give +63 ranged strength and can only be used with crossbows.