Solar Dawn is a magic spell which allows its user to channel energy into their own body, essentially turning themself into a smaller version of the sun. This causes a massive explosion and ends the caster's life. Despite the spell's devastating effects, it's very easy to execute and doesn't require special training.
The ability was used by aritai in her fight against evil ari after consuming the Magic Crystal. While a normal human or other humanoids would be permanently killed by using this spell, aritai only lost one of her nine lives. The spell was powerful enough to completely destroy the Solarie Bookstore, after which it had to be rebuilt from scratch.