Phrosoe is a powerful Irradiate and a super-villain from Champions Online, he hides within the Atomic Wasteland and is an especially hateful creature who wishes to exterminate humanity in order to ensure only he and other mutants will survive.

Phrosoe takes his quest to fanatical heights and orders his minions to capture humans so he may expose them to volatile mutagenes - those who survive are welcomed as Irradiates but those who resist are killed, those who do not survive the process are deemed worthless and thus Phrosoe sees himself as creating a "perfect" world.

Ultimately the player-created heroes are sent to deal with Phrosoe and end his murderous ways.