Change is a sort of energy in the Big Blue. It occurs in areas known as Change-fields. It is an immense energy source, which is why it is often used to power mysterious Builder Technology
Change irradiates and mutates living things, in an eldritch way; people with serious exposure to Change receive Change-burns which manifest as grotesque scars and patches of deformed flesh. More acute exposure or chronic exposure over a longer period of time leads to more extreme mutations which can range from sprouting pincers or tentacles, or producing slime, to glowing in the dark or growing venomous jellyfish tendrils. The mutating effects of change can also be experienced by eating a Mutato.
Whilst some conservative Tritonids are horrified by the effects of Change, warning of its dangers and looking down on those who have been touched by it, others embrace it: the Cult of Xuexuetque especially revere Change as the ultimate reflection of Xuexuetque's wishes and the transience of all things. Reef Devils, who are relatives of the Tritonids that were mutated over generations of Change exposure, see it as a source of energy and life.