Posting this via request of Zekai
Spoiler
Potential of Arcania Ascenda Praecantatia Excitatus's magic
Arcania's magic, True Arcane, is one of the Lost Magic, but it isn't in the caliber of the frequently-seen Dragon Slayer magic or Time magic. This magic was truly lost in the fleeting history, never to be retrieved unless via the only user, Arcania herself.
The concept behind True Arcane magic is that the sheer energy that is employed in the magic tears apart the infrastructure of the target. For example, if her magic strikes, say, a wooden barrel, the infrastructure of the barrl (The wooden base, walls, and lid, along with metal framing) will begin to shatter into its basic parts.
Scarier things happen when her spells attack a living being. For example, if Arcania was in battle with Natsu, and she strikes Natsu with one of her spells, his molecular structure of wherever he was struck will begin losing stability, degrading the cells to the atomic level.
As overpowered as this sounds, this magic obviously has its flaws.
1. The disintegration only occurs for short amount of time, and slowly at that. Unless Arcania emits enough magic energy that could feed a non-magic city of 1 million inhabitants with magic for 50 years in one blast of magic, she cannot immediately incinerate a human being.
2. True Arcane take a lot of magic energy. In comparison to regular energy, the simplest incantation of any element: say, creating a small spark of fire or ice crystal, costs 5 to 10 times more for True Arcane.
3. True Arcane only damages those that Arcania selects in her mind. This sounds more like an advantage if anything, but in a situation of one vs many, having to select all those enemies is hard work for even an Ascended human like her.
Applications:
As True Arcane is like any other element, Arcania can bend it both offensively and defensively. Here are some of the many applications that Arcania uses as her signature spells.
Pulsus: Arcania fires a beam of energy in a straight line. Whatever target Arcanua selects is damaged.
Oculus: Arcania calls down a blast of energy to a targetted location. The blast is caused by Arcania sending a small, concentrated bolt of True Arcane in the air which scatters as it reaches the sky.
Scutum: Arcania develops a thick padding of True Arcane that loses its property to disintegrate physical substances but improves upon the disintegration of magic. With this shield up, Arcania can shred incoming magic projectiles.
Claustrum: Arcania envelops an area with thick padding of True Arcane, similar to Scutum. The amount of magic Claustrum can shred through before dissipating is less than that of Scutum, but Claustrum is useful for large, area-of-effect magics.
Obsidionem: One of Arcania's more powerful magic spell, Arcania renders herself unable to move. However, she js able to lob giant True Arcane "cannonballs" at a ridiculously long range. While unable to move, Arcania's magic energy is drained, fast at first but slower and slower as the duration goes on.