you mean those 100% eidos?
u either drop a sht ton of money and whale a lot on the gacha/promo gachas with their "rate ups" and pray RNG gives u at least one of them
or you save 150 draconic eyes and wait for that special edition miracle ticket that lets you pick anything you want in the game
those 100% eidos have REALLY LOW drop rates, and they are mostly whale bait