I have just beaten a super strengthened Dread League with the Dread Apocalypse on top of the buffs with the Arcturian Order with almost no effort.
The only thing I did was build forts from day 1 and spam regular infantry divisions on the border, I didn't even accept volunteers or use Knights.
Because of the forts the Dread League didn't even attempt attacking me once. I tried attacking them with my full army group and I didn't even come close to pushing them back 1 tile and took tons of casualties compared to them a bit before I instantly annexed them with the Shield of Hope. I had level 8 forts when they declared war on me and ended up with level 9 forts before I annexed them.

Maybe a buff to the Dread Apocalypse needs to come next update.

I am aware that the buff is absolutely insane, for example regular buffs can give them 20% research speed while the Apocalypse gives them 150% and lets them go down both Vampires and Necromancers which is obviously op, so maybe the ai should be changed?