Description:

(this going with the headcanon that Alicorns were a race of ponies that died out in scarcity years ago.)

I think Opaline is a natural born Alicorn with very conservative ideas on what constitutes a Alicorn. So when presented with Sunny's weak alicorn form, she's sees it as a costume worn by a earth pony. A mockery of the "prestige" that is the Alicorn race.
safe2531557 artist:aztrial517 imported from derpibooru3719758 opaline arcana3827 sunny starscout26415 alicorn357791 pony1713055 spoiler:g536437 spoiler:my little pony: make your mark7219 artificial horn816 artificial wings3417 augmented4848 dialogue111473 duo183404 duo female39463 female2024171 g594621 horn214885 magic110535 magic horn731 magic wings1654 mare824257 my little pony: a new generation16570 race swap24918 speech bubble47083 sunnycorn2123 wings273166

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1 comment posted
skybrook

Is it seriously not obvious? Like, seriously?

G4 is canon, so that means if you do something super special you get a merit badge in the form of being transformed into an alicorn princess.

Opaline was a unicorn. And now she lives in her lonely castle, with the only other unicorn who didn't cast her out for being a mutated freak.

Alternatively, she's Izzy traveling back in time to prevent her dark future from coming to pass.