He travels around the world to charge his adamas gem (ATHENA book spoiler)
spoiler
(Random animation cazal plays sometimes.
Comes with teal effect)
Cazal vs Nero, who wins? - #11 by Divanochi
Cazal vs Nero, who wins? - #14 by Divanochi
Since every spawn of cazal contains a lot of energy, this makes sense. (Akurisus keep, Makrianos, Drakos arch hidden place and such)
Cave should have a lot of energy to grow 100 energy worthy glowing mushrooms.