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Impervious Toughness seems to be a common case in M&Ms to represent characters with great resistance to damage. But how do you buy Impervious for Toughness? Impervious is an Extra with +1/rank cost, but you cannot buy ranks of Toughness, only increase it by buying ranks for your Stamina or the Protection power.
Where do I add that +1/rank cost? To my stamina cost?
I can't access my 3E book to see if they restated it, but from the 2E FAQ:
Some archetypes have “Impervious Toughness,” where is this power found?
See the Protection power on page 96, in particular the description of the Impervious extra. It can specifically be applied to the Toughness save as well, which is the case with those archetypes
So yes, you essentially are adding it to your Stamina cost, although the way it's offset in the power section makes it more of an Enhanced Trait which is able to be Nullified and might have its own descriptor (for example, I had one Powerhouse build who naturally had 12 Stamina, but his Impervious Toughness had a magic descriptor).
Each rank of Impervious Protection costs one point. If you have a Stamina of 4, a Protection of 8, and eight points of Impervious Protection, you'd be spending 24 points on it altogether. Similarly, you could have Stamina 0, Protection 12, and make some or all of those ranks of Protection Impervious for one point each - though with Stamina 0 you couldn't make any of your ranks of Stamina Impervious, since you don't have any
