If your Health Token ever reaches 0 , you become Exhausted. Flip your Adventure Card to the Rest side and immediately return ALL of your Heroes to your Castle. Set your Health Token to 6 and your Power Token to 3 for the next round (regardless of your Max Health or Max Power) and lose 1 Spell Level (-1) in the Spell Library (reduce Max Power Token if needed: see Maximum Thresholds). You cannot resolve any more dice actions this round. Even if your Heroes are on the last space of a Temple or the Magic Token is far enough, you do not complete the Temple or learn the Spell in the event of becoming Exhausted, but you do keep any Goblins you already defeated.