Six Ancestors

The Six Ancestors are the heredity line behind all the monsters and the very first offset images of Alice I (First). They are the ancestors of every single monster, aside from the Monster Lords who are direct descendants of Alice I.

In the aftermath of the Great Monster Wars that happened 1,000 years prior, Ilias tricked them into sealing themselves into what was known as the Six Ancestors Great Seal. In present day, Promestein studied and managed to create a duplicate that sealed Alice XVI (Sixteenth), but was partially foiled when Tamamo taught Alice a skill in how to escape the seal, albeit in a weaker form, and later teaches her how to temporarily regain her full power for a very short while.