Minecraft wiki entry for Defeating_the_ender_dragon, associated text: Subsequent dragons drop less experience and do not drop another dragon egg, but it is still useful because it is the only way to obtain more dragon's breath. Also, it creates another end gateway, which can be used to find more end cities more easily, but the player must prepare the same equipment all over again. However, if the player does want to fight again, the player can use new equipment that could not be used in the first battle.