Nightmare Forme Cresselia

Darkrai/Cresselia Fusion

I've made up a backstory for this forme of Cresselia!

'It is a creature only told of in legend. When the rivalry between brother and sister becomes too great, the enraged body of the brother fuses with the sorrowful body of his counterpart. With the brother's nightmarish powers now taking centre stage, there is nothing that can prevent it from poisoning the minds of the world with tormented dreams. In the world's final days, everyone is said to have bad dreams...'

If you can figure out what the final sentence of the story references, you can have this cookie!