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 33% chance on hit to reduce your target's defence based on the damage dealt.
They give + ?? ranged strength and can only be used with crossbows.