im unable to kill zombie hordes and the plugin is working so i guess this is stopping it but the config is difficult to understand ty

Zombie Hordes now uses an entity called ZombieNPC. You will need to add it to the members list for the name "npcs" in the config.

{
"name": "npcs",
"members": "ZombieNPC, ch47scientists.entity, BradleyAPC, HTNAnimal, HTNPlayer, HumanNPC, HumanNPCNew, NPCMurderer, NPCPlayer, Scientist, ScientistNPC, ScientistNPCNew, TunnelDweller, SimpleShark, UnderwaterDweller, Zombie, Murderer",
"exclusions": ""
},

Thank you. Solved