Hey Final Fantasy community; recently reworked the entire concept: sort of utilized some of the abilities / spells from its form in Ff tactics. Also incorporated a chemist style hand cannon that shoots bubbles at party members / enemies.

The bubbles for healing are called “Source” which use up TP
While the weapon skills use up Mana (which is the ammunition for the Source Cannon)

The Mystic also has a few Aetherial based spells that use Mana for healing; but the more powerful and unique coming from the Source Cannon.