http://breezewiki.bunny5exbgbp4sqe2h2rfq2brgrx3dhohdweonepzwfgumfyygb35wyd.onion/crosscode/wiki/Combat_Arts
In practice, however, only a few select combat arts from the non-Spheromancer pools will be seen in-game. Using a combat art uses SP ( Special Points ), with higher-level combat arts costing more: 1 SP for level 1, 3 SP for level 2, and 6 SP for level 3. Generally the total impact (damage, knockback, duration, etc.) of higher-level combat arts scales linearly with SP spent.