Overview[]
The bolt core is a part of the bolt fired by the crossbow.
Crafting[]
To make a bolt core, place an Arrow Shaft, of any type, into a casting table, and pour any molten metal over it. The metal will form the tip of the bolt core and the arrow shaft will become the main material.
(For FTB Direwolf20 1.10 modpack, place an arrow shaft of any type.)