The forces of Chaos are relentless in their war against the mortal realms. They have vowed to not stop until the world all around them matches their home of twisting, shifting, changing landscapes. There’s one group that excels in twisting reality to their whim. They are the followers of Tzeentch, and they’re getting a bunch of reinforcements for Age of Sigmar.
From the website:
Death is perhaps the most lenient of fates that await those who dare defy an Alter-kin Coven. These servants of Tzeentch are so imbued with transmogrifying magics that those in their proximity can be torn apart by these energies, only to be remade in the form of a Tzaangor.