Vizards are a race of beings who have crossed the limit of their abilites and have been able to control their inner hollow. While the term vizard is spelled in the manga using kanji meaning masked army (仮面の軍勢, kamen no gunzei), it is pronounced as the English vizard (ヴァイザード, vaizādo), an archaic word meaning mask. In the English version of the anime, they are called the "Visored" (one who has a visor, or a mask).
In battle, the vizard use their hollow powers to augment their existing ninja abilities, granting them massive increases in speed, stamina, and strength. They also gain access to some hollow abilities, such as the cero blast. Bodily harm can seemingly be ignored while wearing their masks, as demonstrated by Seireitou's hollow during his unwilling transformations. The hollow mask can only be maintained for a certain period before its effects wear off: Seireitou can only hold his transformation for 20 minutes in omega, but later he is able to hold it for an hour or 2 without tiring,