Fairy Tail: 100 Years Quest season 1 episode 19
Episode title: Aqua Aera
White Mage uses Aqua Aera, Touka's spell, to take Fairy Tail wizards to Elentear, her homeland, but they end up in Edolas. After they get reunited with the Fairy Tail in Edolas, Natsu and the others go to see Mystogan for help.
