Huceo Mundo

Hueco Mundo is the home of evolved Hollows, Known as adjuchas, and Vasto Lorde. This world was replaced with a hollow forest in the 1.54 update.

Mobs
Animal Adjuchas, Adjuchas, and Vasto Lorde will spawn around. Vasto Lorde will spawn occasionally, but the more recent updates allow them to spawn very commonly. Gin and Beleham are the bosses of this region, and both drop the "Sword Of Belaham". Gin brings Arrancar mobs with him, and Belaham is alone (in question).

Access
All players level 40 and above have the ability to travel to Hueco Mundo Via Urahara, the portal in his shop, or via the mysterious person.