Does anyone know what Morathi has been up too? I’m keen to know what what the backstory here is.
The trailers and teasers over on WarhammerTV on youtube seems to indicate that she was in Slaanesh's possession for a while, before getting free (no mention how) and most likely going along with Sigmar's Pantheon at some point in the Age of Myth maybe. Then, at some point she hid up in the Realm of Shadows and is really resentful over being mistreated or looked down upon. This is based on her own lines, so I don't know if it's objective in any way.
The most significant change now is that she's the head of the Cult of Khaine it seems, a position Hellebron used to have before the Sundering. Khaine is also referred to as a dead god, so who knows how that works out. She's also called a demigod, I believe.