The power to remember all the crap you crammed for quals.
The power to turn abstract lecture instruction into the efficacious ability to actually do things in the world (without a whole lot of parallel exercises and practice.) Can call it the "School actually does what we assume it does"/"School actually works" superpower.
The entire western world is organized around the assumption that we do have this power. But in my experience, we don't really. The abilities that I have that are immediately available and useful are acquired in a different sort of way (exercises and experience) than whatever happened in decades of lectures. (Math (of the sort that I can call up and use fluently), programming, electronics engineering, etc.)