Grand gems are only needed for Ghosts and Mammoths, making fighting these creatures desirable for the best enchantments. What creatures fill grand soul gems Skyrim? Humanoid races possess grand souls, but can only be trapped in a black soul gem or the Daedric artifact the Black Star, which is obtained through the quest of the same name. Larger or higher-leveled creatures possess greater or grand souls, such as mammoths (grand) or giants (greater).