multiplayer spawn egg glitch
When you use inventory editors to get a spawn egg in Survival mode, and give it to a client playing on your world, when they use the spawn egg it spawns a mob, but does not use up a spawn egg.
When you use inventory editors to get a spawn egg in Survival mode, and give it to a client playing on your world, when they use the spawn egg it spawns a mob, but does not use up a spawn egg.