Diamond bolts (e)
From Emps-World Wiki
Diamond bolts (e) can be created by tipping Adamant bolts with Diamond bolt tips and then enchanting them with the Lvl-4 Enchant spell from your Normal spellbook.
These bolts have a 20% chance on hit to reduce your target's defence with 5 levels.
They give +78 ranged strength and can only be used with crossbows.