Fairy Tail: 100 Years Quest manga volume 18 features story by Hiro Mashima and art by Atsuo Ueda.

The battles between Fairy Tail and Diabolos continue to rage in the labyrinth, with both sides beating the living daylights out of each other. Selene's enjoyment of the violent spectacle comes to a screeching halt when the fire dragon god Ignia suddenly appears, throwing the worst wrench in her plans. Natsu, of course, is instantly fired up to fight Ignia, but Ignia's got plans of his own--secret plans that may spell disaster for all!