Note for the future:
Tier 2 Battle Tactic - Spirit Admixture I through IV

Spirit Admixture allows you to mix 2 spirits at the same time. This does not affect the damage, just the types that each attack applies.

Spirit Admixture I allows you to admix two spirit types that average their level to 4 (maybe??), like Disruption(7) and Mana (1) = 8/2 =4