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Description
With Twilight now the sole ruler of Equestria, Celestia and Luna decide to get her a personal guard. They better get her a glass of water too, because Twilight’s looking pretty “thirsty”.
Edited
He’s a guard of both then since he was seen at canterlot library too.
No ♡
He’s a guard in the crystal empire not a royal guard in canterlot.
No when he’s a guard in the crystal empire, not in Canterlot.
It should be flash. Hell, it be alright if it was both him and gallus.
It is possible that Flash Sentry is the pony responsible for mentoring and training Gallus as the first Griffon in the Royal Guards.