Black bolts

 Black bolts are bolts that can only be acquired by completing a level 1 Treasure trail or by trading with another player. They can only be fired from a black crossbow or better.

Please note, black crossbow bolts are not able to harm the Tormented Wraith, even when being used in conjunction with a black crossbow, the reason for this is still unknown.

Weapon poison potions can be used to deal additional damage.

Poisoned versions
Black bolts