I did this as a request several years ago, before I even watched MLP (and to be honest quite sick of hearing about it at that point). But the request intrigued me, to draw Princess Celestia as a Final Fantasy boss.
Since FF has a long history of muddling various mythologies together I took a Norse inspiration and remade Celestia after Odin's 8 legged steer. The effect was... interesting to say the least. I might have gone a bit overboard with the effects but then again FF has been more about spectacle these days anyway...
Princess Celestia is property of Hasbro