Neutron

Neutron changes how mobs decide whether to attack a player. A server admin can turn a mob neutral toward a given player or toward every player, and the setting can be set for one mob type at a time. Neutral mode is off by default and has to be switched on with commands, so a server keeps its normal difficulty until an operator opts in.

Default settings cover boss mobs and certain structure-exclusive mobs, which are turned neutral so they can be avoided, while a list of exceptions keeps some mobs hostile. Endermen can be set to ignore eye contact from players affected by the mod, and actively patrolling mobs can stay neutral even when other types are listed as exceptions. Most player actions still anger neutral mobs, and the Ender Dragon uses the normal targeting system. Wearing gold armor stops piglins and some other mobs from holding a grudge. The mod is server required and client optional, so the server must run it while players may leave it out. Its code is open source under the MIT License.