Great Void


 * Not to be confused with a similarly named area that only exist in the Hollow Fragment game.

The Great Void (グレートボイド) is a bottomless hole with roughly 1.5km diameter existed in Jötunheimr of ALfheim Online directly down below Þrymheimr, around 1km below Alfheim. Yui once stated that its bottom structure is undefined in map data, but by the time of Caliber quest, Urðr stated that there're a Niflheim below Jötunheimr and Yui also suggested there is a Muspellheim further below it and it'd been raised with the possibility that the Great Void would actually connect with them.

Description
Initially, its wall is covered by ice with color gradient shifting from transparent white on the top part to light blue, blue, deep blue and finally dark black. According to background information, before invaded by Trymr, it was a wide lake filled with shining water with root of Yggdrasil extended into it and extend to surrounding. It's then recovered after the Caliber quest completed.

Fairy Dance
After Kirito and Leafa being grabbed by Tonkii onto his back and moved till the southern side of the Great Void for a nap, they meet a team of 24 undine players wanting to hunt Tonkii. After some attack and defense, Tonkii grows 4 pair of wings out from its body, defeating undine players and carry Kirito and Leafa fly above the Great Void to a stair connecting Alne.

Caliber
Kirito and other team members who are on their way to complete the Caliber quest, stepped down from stair extended from Alne to Jötunheimr and ride on Tonkii to the side of this Great Void, to accept the petition from the queen quest, before they fly high up to the Þrymheimr.

After Thrym being beaten and Excaliber being retrieved by Kirito, their team located on a circular platform is dropping toward the Great Void, before they're retrieved by Tonkii and then Sinon also help retrieved Excaliber from falling to the Great Void.

After Þrymheimr completely collapsed, the Great Void turned back to a lake as described above.