Cosmo's transformation

Blossemed Cosmo is a super transformation of Cosmo the Seedrian

She only took this form in A Fearless Friend, where Hertia appeared to her and told her only she could save the galaxy. Cosmo's amulet then shatters and she transforms, helping Super Sonic and Super Shadow defeat Final Nova, an enhanced form of Dark Oak. Eventually, she sacrifices herself and fuses with the Dark Oak planet, allowing Tails to fire the Sonic Power Cannon, destroying the planet and killing Dark Oak and Cosmo. However, Sonic and Shadow use Chaos Regeneration. Although it keeps her alive, it turns her into a seed no one can react with. However, in the dub, Chaos Regeneration is not used and Cosmo implies the seed is her child.