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Sanctuary is one of Charlotte Aulin's magic spell skills in Castlevania: Portrait of Ruin. It is found in the Sandy Grave, in a room with a rolling boulder on a down slope. Charlotte must have already learned Toad Morph if she wants to get it; the space is too small for her or Jonathan to walk through. Obtaining it will also trigger an additional conversation with Wind, should the duo visit him again in the Entrance.
The spell takes a very long time to cast, so it is advised to have Jonathan protect Charlotte so that she is not interrupted. Once cast, Sanctuary releases a wave of holy light from the ground to about mid-screen. Anything caught in the light is healed of any ailments and it can be used for a variety of effects. Most importantly, it is used to heal Vincent, Loretta and Stella of their vampirism; without it, the player would kill Loretta and Stella, getting the bad ending of the game.
It can also heal players with Poison or Curse effect ailments, though the time it takes to cast makes it impractical. Lastly, it can be used to destroy Red Skeletons and Red Axe Armors sooner in the game, as opposed to the Undead Killer whip, which most probably will be obtained until much later.