Mutations cannot give characters HD or WD in any Mind, Charm or Command Skills, except for Intimidation— unless the GM says so. If the hyperskill makes sense as a physical extension of the mutant’s power, it might work. Mutation can’t give HD or WD in those Stats.I'm trying to put on a "setting designer hat" to understand the reason for these limitations. I'm guessing that the Variable Effect limitation is both to prevent mutants from stepping on magician characters' toes.
The “Variable Effect” Extra must be taken with an “If/Then” Flaw that limits it to a particular theme or type of power. This precludes “anything goes” Miracles based on Variable Effect, such as Gadgeteering and Cosmic Power.
Mutant
What They Can Do: Pretty much any physical effect.
Limitations: No HD or WD in Mind, Charm or Command— but see “Variations,” to the left. No telepathy, no detection or control of really abstract principles (“danger,”
loyalty,” “madness”), no emotional control.
-G.