Without a doubt, Reiger's first enlightener was Ais.
His first Magic was learned from Ais.
His first sword technique was learned from Ais.
Before encountering Ais, although Reiger could also enter the underground city and fight monsters, he relied on some unremarkable combat techniques from his past life, using brute strength, experience, and overly excited emotions to recklessly battle monsters.
It wasn't until he learned Magic and sword techniques from Ais that Reiger finally became like a swordsman, like an adventurer, no longer just a barbarian mindlessly fighting monsters.
But for the Reiger of today, the sword skills learned from Ais have already become a thing of the past.
After leaving this world, Reiger has already experienced several worlds.
In the Demon Slayer World, he learned numerous breathing styles, gaining new powers and new sword techniques.
