The goo is a mysterious form of pollution that seems to be consuming the planet Atys. The kami are actively trying to resolve this problem. For now, the Goo continues to expand.
It first appeared in the prime roots, but it has been observed on the back of the planet and some pretend that it is already reaching the Canopies.
It uses the network of sap veins within the planet to travel, and bursts out on the new territories it reaches.
Creatures and homins can seriously be contaminated by the Goo. A creature infected seems to become a lot stronger. It also looses its self-control and seems to be under the control of the Goo.