From EncyclopAtys
A long time ago, a group of corrupt Zoraïs disobeyed the Kamis and used the Goo for criminal purposes.
On an expedition near the Goo, they came across a Kami.
Expecting to suffer his wrath, they were surprised to find him welcoming them warmly. The kami even decided to take them on as disciples.
The Zorai voluntarily contaminated themselves to prove their devotion to him, and founded the Goo Heads sect.
It is said that this kami had lost his link with Ma-Duk because of his proximity to the goo.
But he has since disappeared.
Perhaps another kami has also been contaminated.
The paths that lead to Ma-Duk are sometimes tortuous.
I'm sure you won't stray far from Ma-Duk after this.
For Ma-Duk protects us all and we must all seek to find our way to him.
Your path may be to be closer to the homins, but it will still lead you to Ma-Duk's wisdom!