So I noticed in 100 year quest we learn that Spiria, the stuff that Spirits are made of can be Enchanted into people, as we know Slayer Magic is said to have been born out of Enchantment, this implies spirit Slayer Magic may be introduced in canon as a concept. Makes me wonder if like how Kishimoto reads naruto fanfiction often (the Senrigan fiasco) if Hiro Mashima reads this wiki and he got some ideas from us. If anything this implies the abilities of spirits can be incorporated into a Mage's body in the form of Slayer Magic.