Old Entity

"Old Entity", known as "Old God" (古（コ）神（シン） Koshin) in the OCG, is an archetype of Synchro Monsters based on the Great Old Ones from H. P. Lovecraft's Cthulhu Mythos, and is directly related to the "Elder Entity" and "Outer Entity" archetypes, the three each being a subtype of the larger "Entity" series. Currently, its only members are "Old Entity Cthugua" and "Old Entity Hastorr", with its only support card being "Forbidden Trapezohedron". Both were released as exclusive cards for the Korean releases of Duelist Alliance and Secrets of Eternity.

Old Entity
"Old Entity Cthugua"
Japanese	古（コ）神（シン） 古神 (base) コシン (ruby) Koshin (romanized) Old God (translated)
French	Vieille Entité
German	Altes Wesen
Italian	Entità Antica Ancient Entity (translated)
Korean	고신 古神 (Hanja) Gosin (romanized) Old God (translated)
Portuguese	Entidade Antiga
Spanish	Entidad Primigenia Primitive Entity (translated)
Sets TCG 2015 Mega-Tins Shadows in Valhalla OCG Extra Pack 2015 Tournament Pack 2019 Vol.4 Korean Duelist Alliance Secrets of Eternity Advanced Event Pack 2017 Vol.1
Manga appearances
Yu-Gi-Oh! OCG Structures
Lists	Members Support