Defeated mobs from each wave during the event will have a chance to drop the Irradiated Undercoat. Equipping it allows the player to collect Unstable Isotopes. 100 Isotopes are required to activate the on-use ability of the shirt. Doing this 5 times (shirt has a 1 day cooldown) will deplete the shirt, and result in a Melted Irradiated Undercoat which teaches the pet.
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