Nothing change, when i'm not in the other player's faction, it work because the event isn't cancelled by the Factions plugin but when i'm in the same factions, there is no broadcastCan u try this + restart.
Code:import: org.bukkit.event.entity.EntityDamageEvent org.bukkit.event.entity.EntityDamageByEntityEvent on damage: uncancel event on EntityDamageEvent with priority highest: broadcast "e" on EntityDamageByEntityEvent with priority highest: broadcast "f"