Spiritual Arts (霊術 Reijutsu) are the main form of combat utilized by those who can gather Suspiria.
Differing from Magic and Curses, Spiritual Arts is a different attribute that is created by Suspiria, an attribute that became developed in areas of Elentir. Magic or magical weapons cannot affect any Spiritual Arts, instead only Spiritual Arts can counter one another.
According to Irene, Spiritual Arts are a third type of fighting essence outside of Magic and Curses, given it's made from Suspiria in the surroundings similar to how Ethernano is what Magic is made from.
- Fairy Tail: 100 Years Quest Manga: Chapter 70, Pages 2-11