Artifact crossbow Thunderclap, which fires either lightning or lightning-enhances the crossbow bolts it fires, and you can invoke it to create more bolts.

There should be silver crossbow bolts so people who want to use a crossbow can still get silver damage.

Crossbows deal more damage than bows, but the multishot bonus is lower because they are slower to reload.

Note a similar implementation in dNetHack, where crossbows always only shoot one bolt but the multishot amount multiplies the damage of that bolt.

The Oracle centaur statues may contain sizeable piles of ranged ammunition, particularly arrows and crossbow bolts.