Winx Club Forever
Ancient Crow’s Dust is a material able to render its target powerless temporarily.
Ancient Crow’s dust is housed in a black square box with gold ornaments. When in use, the box unfolds into a black crow that releases black dust on the target.
In "The Crystal Labyrinth,” Valtor, having stolen the dust from the Dark Dimension, gives it to Icy with the intention of destroying Bloom. Later in the Veil Mist Forest, Icy uses the dust on Bloom, rendering her powerless.