Goetia

The "Goetia" (ゴエティア in the OCG) are a series of 72 monsters, mostly Xyz Monsters, that are based off of a series of 72 demons, the Ars Goetia, listed in an ancient tome called The Lesser Key of Solomon. These monsters were artificially created by DATEA to combat the threat of the Numbers to their expansion. As such, these monsters possess a very anti-Xyz Monster feeling to them, and contain powerful effects for fighting against Xyz Monsters while also Ranking Up. All of them, save for a select few, are EARTH, FIRE, WATER, or WIND.

Theme
The "Goetia" monsters are the antithesis of the Numbers, and, as such, possess some commonalities. First, each of the "Goetia" have a marking on their bodies similar to the Numbers, but different. These markings are a special insignia, with their Roman Numeral placed in the center of the circle. Each title of the "Goetia" has a different insignia displaying their power level: Also, each of the "Goetia" has a special title that they are called that represents their place in the hierarchy. This is further reinforced by the crowns that each "Goetia" member possesses. A golden band with gems embedded into its circumference, usually a crown worn atop the monster's head, is common among every single "Goetia" monster, and the more elaborate the crown, the more powerful the monster. The effects of the Xyz Materials of these monsters are usually channeled into the central gemstone of the crown.

Playstyle
The "Goetia" are incredibly against Xyz Monsters, and have various effects to combat their fellows and triumph over them. The first is that each "Goetia" Xyz Monster has the power to gain the effects of each "Goetia" monster attached to it as Xyz Material. This makes Ranking Up a viable strategy, as the effects can keep stacking and stacking. Other than simply countering Xyz Monsters, the "Goetia" seek to proliferate their own kind, Special Summoning other "Goetia" monsters being a common effect, as well as recycling and searching for Rank-Up-Magic cards. Their primary weakness is their reliance on Xyz Monsters, and a deck dedicated to doing anything but Xyz Summons is more than a match for this archetype.