Spirit Soul (スピリットソウル, Supirittosouru) is a special ability which premiered in BS24. It is not restricted to any particular color. However, spirits with this effect usually have a low cost.
The effect reads:
- [Spirit Soul: (Colour)] When you summon an ultimate, this spirit adds a (Colour) symbol." The timing of this effect varies by spirit.
Like Immunity and Invincibility, there is also a variation of [Spirit Soul: Infinite], which is more powerful than the original ability. This effect reads: When you summon an ultimate, this spirit adds 2 symbols of the same color as the summoned Ultimate. Currently, only Mugendragon-Nova and Meteodrian have this effect, which are both dragon characters in the Saikyo Ginga Ultimate Zero Battle Spirits anime.