MENOS

Menos (メノス menosu?, Spanish for "minus" or "less") Hollows have an unusually strong thirst for souls, which leads them to consume other Hollows and evolve into a stronger state of being. Within the Menos are three levels of evolution, each with superior strength, speed, and intelligence compared to its previous form. The first of these are the Gillians (最下大虚（ギリアン） girian?, Japanese for "least of the great Hollows," Spanish for "Countless Creature"), or Menos Grandes (大虚 (メノスグランデ menosu gurande?, Japanese for "Great Hollow," Spanish for "Great Minus"), which normally reside within the Menos Forest located below the desert surface of Hueco Mundo. The Gillians are powerful giants, born when countless cannibalistic Hollows gather into a feeding frenzy until they are mingled into one form, with very little intelligence or individuality as a result of being a collective mass of hundreds of Hollows. If one of the Hollows that now make up the Gillian retains its consciousness, the Hollow dominates the entirety and, after eating enough Hollows (including other Menos), eventually evolves into an Adjuchas (中級大虚（アジューカス） ajūkasu?, Japanese for "intermediate great Hollow").

Semi human or animal-like in nature, and smaller in size, the Adjuchas are able to fight against Soul Reapers, yet must continue eating Hollows so they do not regress permanently back into Gillians, with their minds destroyed in the process. There are some cases where Adjuchas halt regression when another Hollow devours even a small piece of their bodies, as well as cases where Adjuchas can command groups of Gillians. The few Adjuchas that transcend their limits become the Vasto Lordes (最上大虚（ヴァストローデ） vasuto rōde?, Japanese for "great king of the Hollows," Spanish and pseudo-Spanish for "vast lord"), the most human-like of the Hollows whose powers are thought to be greater than that of a Soul Reaper Captain's, to the point where Captain Tōshirō Hitsugaya speculates the Soul Society would be doomed if Sōsuke Aizen manages to get more than ten Vasto Lordes under his command