Crossbow Bolts

Crossbow bolts are the standard type of crossbow ammunition, and the first and most basic accessory that Corvo Attano and Emily Kaldwin receives for the weapon. They are also called wristbow bolts when used for Daud's wristbow, or voltaic shots when used for Billie Lurk's voltaic gun. Though the bolts will often break after use, they can sometimes be retrieved from corpses. If an enemy is unaware, a bolt to the head will kill them instantly. Though they do not do as much damage in a fight as the standard ammunition of the average pistol, they are much more accurate, have better range, and are also much quieter.

Dishonored

 * Reinforced Bolts - Bolts stuck in enemies break less often.
 * Scavenger - Greater amounts of ammo on discovery.
 * Quick Dodge - Enemies miss more often with arrows and bolts.

The Knife of Dunwall and The Brigmore Witches

 * Reinforced Bolts - Bolts stuck in enemies break less often.
 * Scavenger - Greater amounts of ammo on discovery.
 * Splintering Bolts - Bolts shot by wristbow do more damage, but almost always break when shot at enemies. (The Brigmore Witches only)

Dishonored 2

 * Assassin's Fortune - Bolt packs have a slight chance of containing +1 crossbow bolt.
 * Exacting Aim - Your crossbow bolts inflict slightly more damage.
 * Splintering Bolts - Crossbow bolts do more damage, but always break upon impact.
 * Unsteady Hand - Enemies miss with fired projectiles more often.

Death of the Outsider

 * Exacting Aim - Your voltaic shots inflict slightly more damage.
 * Splintering Bolts - Crossbow bolts do more damage, but always break upon impact.

Trivia

 * The only enemies that carry crossbow bolts are the Whalers. The ammo can be obtained by pickpocketing them or looting their body.
 * The Howlers also use wristbow bolts but they do not drop the ammo.
 * With the exception of sleep darts (when Lucky Needle bone charm is equipped) and voltaic gun's fountain pens, crossbow bolts are the only ranged ammunition that can be recovered.
 * In Dishonored 2, should the protagonist shoot a crossbow bolt into a piece of food such as an apple and the bolt sticks in it, then consume said food, he or she will take damage as if struck by the bolt being fired by the crossbow.

Gallery
Virotes de ballesta Арбалетный болт Dardi da Balestra 十字弓箭