Thanks!Though, oddly, "category" is not a valid category.
Temporary_PowersTerraVoltaTraining_GadgetsTrollscategoryTsooTuathaTurretsUnseelie_CourtVahzilok
I'm not sure if this is a bug in CoD or just something weird in the game but the Mastermind Heat Mastery epic has the full name Heat_Mastery_Stalker.