Minecraft wiki entry for Combat, associated text: The crossbow can also use firework rockets as ammunition. Firework stars with an explosion effect deal 5-6 damage with 1-2 additional damage per an extra firework star, and up to 7 firework stars can be used. The mean firework rocket damage ranges between 11-18, which deals splash area and can damage endermen and the wither during its projectile armor phase. Additionally, each firework star can be dyed (with a large ball effect), which may obscure another player's vision (due to the particles color).