Minecraft wiki entry for Crossbow, associated text: When killed, a pillager has a small chance (8.5%) of dropping a loaded or unloaded crossbow with random durability; the drop rate increases by 1% per level of Looting: 9.5% with Looting I, 10.5% with Looting II and 11.5% with Looting III. The dropped crossbow can rarely (10% chance) be enchanted at level 5–19 regardless of being enchanted when it spawned.