Downside: You've been turned into an emotionless machine.Downside: Every Stair is as long as the Niesien Railway's ones, which have 11,674 steps.
Power: Be good in math cuz im dumb
(Honestly, I don't see why it is a downside but I can't think of another one right now. )
Power: The power to write like a professional Master calligrapher. (Alright, people! Whatever downside you're gonna give, don't mess with the mastery! Alright? Alright! Anything but the mastery, really! I want nice handwriting! )