As I scroll through warhammer lore videos, i keep seeing referance to a 5th chaos god existing. Im not talking about the one in legal limbo, but i do see three characters mentioned as if they already hold the position; The Dark King, Vashtor and the Greater Good. Have any of these charachters (entities really) achieved that throne or are people just trying to incept their fan ficton into reality?
The Greater Good manifestation, which is explicitly a minor god, was caused by humans converted to the Tau cause and was witnessed during the 4th sphere expansion. This is from War of Secrets.
Vashtorr isnt tied to any gods, and he’s a daemon not a daemon prince so he can’t be chaos undivided, so technically he is a minor god, as all daemons are just splinters of their god. Belakor is a daemon prince of chaos undivided for example.
Interestingly enough Fabius Bile is becoming a chaos god because the people he has created worship him. See the Fabius Bile trilogy.
There are also the Eldar gods like Ynnead are full blown chaos gods themselves though obviously not as powerful as the big 4. The big 4 have never been the only gods in the setting just the most powerful and influential.