AP is a term used in Epic Heroes as Energy or a point system for running dungeons. One AP will be granted every 5 minutes and the user starts out the game with 120 AP. You are able to refill your AP by purchasing an energy refill for 40 Runes at a limit, using your Daily Login Reward or by purchasing 1 Rune Summon as a Reward known as "Rune Summon for AP". You can also increase your Max AP by leveling your Player Level and gaining new Arena Titles.