Yggdrasil

Yggdrasil is the main setting of the Grand Cross Original Series arc, Ragnarok: Fate of Gods.

Background
Yggdrasil is a giant tree whose branches and roots span nine different worlds. As for now, only five of these nine worlds were presented on the story so far.

Midgard
The realm of the humans.

Jothunheim
The realm of demons and giants and birthplace of the God of Chaos, Loki.

Asgard
The realm of the gods, ruled by Great Odin.

Alfheim
The realm of fairies ruled by the twins Freyr and Freyja.

Helheim
The underworld and kingdom of the Goddess of Death Hel.