CombatEventsCore implements new Combat-centric events for plugins that need to track Combat more heavily:

Currently there are 3 new Events:

EntityKilledByEntityEvent PlayerEnterCombatEvent PlayerLeaveCombatEvent

CombatEventsCore comes with a few of it's own configuration options:

Camper Detection Combat Time Combat Entrance/Leave messages Allowing Tamables to put a player into combat Allowing enemies that target a player to trigger combat. Deny certain commands while 'in-combat'