Relix

Realix is a realm which holds the Ultimate Power of the Universe and can only be opened by the four pieces of the Codex. It was described by Darkar as a three-dimension Universe.

The Portal to the Realix cannot be opened with Dark Magic only and Darkar captured Bloom and turned her into Dark Bloom so that her Dragon Flame, which is a power of light, will balance his power of Darkness, enabling him to open the Portal to Realix. It is therefore assumed that the portal can neither be opened with the power of Light only and that one needs either both powers of Light and of Darkness or a neutral power which has neither light nor darkness to open the portal. That was why the Guardian Pixies were able to open the Portal at the end of Season 2, because they did not have powers based only on Light or Darkness.

Even in the realm of Realix, Darkar needed the power of the Dragon Fire to gain the Ultimate Power. For this, the keeper of the Dragon Fire had to perform a magical ritual, and Darkar made Bloom perform that ritual when she was Dark Bloom.

With the help of the Guardian Pixies who, having a copy of the Codex, were able to open another portal to Realix, the Winx, the Specialists and the teachers and headmasters of the three schools (Alfea, Red Fountain and Cloud Tower) went to the Realix Realm to rescue Bloom and the Trix went there to take revenge from Darkar for having betrayed them. Sky helps Bloom become herself again by revealing his feelings for her and the Winx defeated Darkar by using a Charmix Convergence. After that the Realm of Realix was sealed for good, since there were no longer any Codex to go there, and the Trix remained imprisoned there after the final battle with Darkar for some weeks till they were captured by the security services of Magix (it has not been shown how they had been able to enter Realix or to get the Trix out of there to capture them), frozen and sent to the Omega Dimension.

Appearance
Realix seems to be consisted by mostly void, with ruins of an ancient stone building floating in it and stones floating around these ruins. The air or sky of Realix has a reddish to grey color.