Spell Basics

Spells are abilities that a Resonator with a help of a Maestro, or a Natural on their own can use.
These manifest in the seven non-Null Elements, as well as Shielding and Healing

Terminology

Basic Spells - Basic elemental spells, Null Element Resonators can use these
Advanced Spells - More intricate spells, usually with bonus effects, these cannot be used by Null Element Resonators
Ossia Spells - Mixed element spells
Ultimate Spells - The strongest spells possible for that element. Each Resonator only can have one Ultimate spell, and which spell they get depends on how they battle
Crescendo - The ability for Shielding and Healing attribute Resonators to use lower level spells of the other attribute

Basic Structure

When read out by a Maestro, spells have a structure to them that determines the power of the spell being cast as well as how to cast it.

[The spell itself], {Power modifier}, <Any other casting modifiers>

For example:
"La Bella Vita, Presto, Tutti" - This tells a Healing-Attribute Resonator to a weak(Presto) heal(La Bella Vita) on a target(Tutti)