You use Tp to access the strong spells (strongest spells in the game in Necronomicon). Once you load it, it doesn't use TP to cast them. They can be used for many turns. She also has free spells that are pretty weak, but the parasite will do nice single target damage and triple CC one one guy. She's great once you lvl her up. The her debuff makes your spells do noticably more damage as well.Been a bit since I played this but I really wanted to like Mana. However I hate the play-style. Use...TP to get the right to use high end spells...which require TP to use. ok battle is over. new battle....Use more TP to get the right to use high end spells...which again require TP to use.
unlocking grimoire levels should have permanently given us access to her spells.