The Lambent Pandemic was the infection of the surface of Sera by the Imulsion parasite. Initially, the Lambent only consisted of Locust that had become infected and mutated through exposure to Imulsion, but it soon spread to infect surface creatures as well as humans. This new threat forced the COG to ally with the Stranded to fight against both the Lambent and the remnant of the Locust Horde, which resulted in a three-way war for control of Sera.