Minecraft wiki entry for Firework_Rocket, associated text: The explosion of a firework rocket deals damage to mobs and players that are within 5 blocks and not obstructed by solid blocks. The maximum damage of a rocket with one firework star is 7, with the damage decreasing with distance. Each additional firework star on the rocket adds 2 points of damage, for a maximum damage of 19 × 9.5 with 7 stars. Using commands to add additional firework stars results in more damage. The damage dealt is unaffected by any other ingredients used. The explosion does not destroy end crystals nor damage the Ender dragon, but does destroy armor stands.