If the ability is of a Magical type, it's usually necessary to determine its cost in MP (Magic Points).
The MP cost of a magical ability should be between 1 and 5 MP.
Creatures are not subject to MP costs. To address this, you may need to limit the number of uses of magical abilities per combat.
Example:
Ethereal Shield (C - MA - Support - 3 MP): The character can summon an ethereal shield that protects them from physical attacks for one full turn. Physical attacks targeting the character during this period will have a -2 penalty to their attack roll.