A: The special powers referred to on Creepers that can be canceled out are found in the paragraphs describing any special abilities or qualities of a given Keeper/Creeper in play. There’s nothing special about the card type, title or something like Doom/Anti-Doom or other category symbols which grants inherent powers or abilities which could be negated.

If there’s something specific about being impaired, it will be mentioned in that descriptive text.