Regeneration

Regeneration is the ability to restore health in exchange for MP over time.

Soma Cruz is able to use this ability with Yellow Souls. In Castlevania: Aria of Sorrow, it can be obtained with a Giant Worm soul and will only work when standing still. A similar Guardian Alura Une soul in that game will cause an Alura Une to appear behind him and restore his health at a much faster rate and without the need to stand still. He can use this ability from The Creature's soul in Castlevania: Dawn of Sorrow and Castlevania: Harmony of Despair.