Four and a half months later.
Grimm returned on the Void Fortress again after completing his mission of leading the Bright Demon-Hunter army to kill the Ice Bats.
A year and a half in the Burrow World had passed since the beginning of their expedition, which was equivalent to two years in Sorcerer World if converted to the time calculation of twelve-hourglasses-a-day.
Grimm walked around the Void Fortress to collect information about the Burrow World.
Due to Grimm's background as a Demon-Hunter with Rank 2 Honor Badge, and the fact that the Black Isotta personally called out his name before the expedition, no one recruited Grimm to execute any Demon-Hunting mission.
Of course, the main reason was Thousand-eyed Carcinus under Grimm's feet.
