The Gogen(Translation: Original Five) are a group of dragons that are said to be the ones to create and teach nature transformations to humans. They are also called the The Five Great Elemental Dragons. Similar to the Tailed Beasts, they are are able to be sealed in a host. But unlike the Tailed Beasts, they are living creatures not entities made out of evil chakra. The Tatsushiro Clan can summon these beast at will since their clan were the great dragon's descendants. Strong shinobi not of Tatsushiro blood have known to summon these dragons but they have to infused the elemental chakra within their blood then used the normal summoning technique.