Geddonase is a toxin given by stinging insects that was introduced to the Creatures series with the release of the Purple Mountain Norns and the Cave Fly. Forest and Ron norns are also susceptible to its bite. In Creatures 1, geddonase attacked both glycogen and glucose, making it a more potent toxin than glycotoxin.
In Docking Station, the stingers can give norns a dose of geddonase. In C3 and DS, geddonase attacks adipose tissue, and also attacks the Liver Catabolic organ, which breaks long-term stored tissue (adipose, muscle tissue, glycogen) down into useable components for everyday biochemical functions. source