The Sundering: Rise of the Witch King is a mod for Medieval 2: Kingdoms and based around the fantasy world of Game workshop's Warhammer universe during the civil war between the Elves, the mod's campaign opens with the Death of Bel Shanaar in -2751 IC.
Horrors of Tzeentch are living embodiments of magic and change, daemonic creatures made from the raw energy of the Realm of Chaos. Their form is constantly shifting according to the whim of the Changer of Ways as they scamper around with boundless energy, madly cackling and shrieking as they go. They glow in brightly colored hues of pink, purple and blue, and when they gather in groups their individual forms can become indistinct as they seemingly merge into an incandescent energetic whole. Magical energy constantly discharges from them in sparks and flashes, and their passing leaves a glowing trail of luminescence.
This is something I've never seen before!?