Sorry if this is a common bug, but I literally spent 30 minutes trying to find a fix but I only found out that it's the base damage going crazy and the damage cause is ENTITY_ATTACK. So this doesn't happen to everyone. It happens to specific people and it sometimes goes away. It's where fists do like 5.5 damage and my friend has a bug where he 1 hits people. His base damage is always changed to 1000. Weapons do not reset the attack damage at all, it only increases it. Plugins: CoreProtect, Citizens, WorldEdit, Essentials, EssentialsChat, GroupManager, VoidWorld, ProtocolLib, Multiverse-Core, Multiverse-Portals, KitAdder, HolographicDisplays Also, my friend had this bug ever since he had a slimeball with sharpness 1000 or something like that. But he has never used it since then but the damage is still bugged. He doesn't have the slimeball in his inventory when he 1-hits. Just if this helps at all. Version: Spigot 1.8.8-fdc1440-53fac9f There is also a bug where the inventory goes out of sync and you can't move stuff around in it without rejoining.