Emboulden Is a Magic Spell in Ghosts 'n Goblins Resurrection, equipable with 5 Umbral Bees after unlocking Lightning I. This spell will encaptulate Arthur in a boulder for a brief period of time, granting higher defense while being able to kill any smaller enemy that touches him while in this state. the time period shortens with every hit from touching an enemy or attack before it reverts Arthur back to normal with a short window of invinciblity.
Once Resurrection I has been unlocked, Arthur can spend 13 Umbral Bees to unlock Emboulden II, making him into a larger boulder that can take more damage and deal more contact damage before reverting him back to normal.