...One of you Winx...
Graynor is a realm of the Magic Dimension.
The Challenge of Graynor
The Challenge if Graynor is a competition in which the best Fairies of the Magic Dimension take part to obtain a magical power. For this, the Fairies have to find the Creature of the Rainbow Mantle and bring it to the ruins of Graynor. The Rainbow Creature looks like a normal horse and it reveals its powers only to worthy Fairies and gives them a new power.