Soul Consumption. When a schism yakirian consumes a creature's heart, it also consumes the soul. The duration of the benefits increases to 8 hours. In addition, the yakirian gains advantage on all attack rolls, ability checks, and saving throws, and all attack rolls made against the yakirian have disadvantage. The soul is trapped within the yakirian for 24 hours, after which it is destroyed. If the yakirian dies before that time, the soul is released. While the soul is trapped, any magic used to revive the dead creature fails unless the caster succeeds on a DC 15 spellcasting ability check. Once the soul is destroyed, only a wish spell can bring it back.