Got bored. Drew this.
Think of it as when she reaches her magical peak.
I went for a "powerful gracefulness" feel instead of "badass flaming rage".
If pegasi have a wingpower scale, then unicorns should have a magic scale.
I'm thinking a decimal number. 1 = Celestia.
So a normal unicorn would be rated 0.17 mu (magical units) when relaxed.
Rarity = .26
Twilight = .42
Trixie = .39
Luna = .81
Nightmare Moon = 1.2
Discord = 1.9
A changeling = .25
Chrysalis = .74
Filly Twilight (During the entrance exam) = .73
Any of the Elements of Harmony when active = .98
Sweetie Belle (canon) = .09
Sweeite Belle (Post Crusade) = .28
Other sub-species should also have smaller magic quantities. Must be over .11 to exert magic.
Pinkie Pie = (Untestable. The machine breaks every time she tries it. She owes us 40,000 bits.)
Rainbow Dash = .0183
Applejack = .0182
Fluttershy = .0187
Spike = .12