I play Empire and I often struggle with Chaos invasions. I have no issue claiming new territories and defending them, until turn(s) 150+. Suddenly the landscape itself changes. Cracks of lava appear, giant spikes jet out of the ground, and the land goes from a lush shade of green to black and ash! In my most recent play through I was absolutely destroyed by three massive armies that attacked Altdorf simultaneously. My level 20 Karl Franz (On Deathclaw) was killed instantly! I tried to retreat to Nuln and build up to retake my former capital, but the armies kept hitting like trucks and I ended up deleting the save. In a matter of 5 turns the Empire I had spent so long building was a smoking Chaos pit with those floating rings above every city!
I'm looking for some general advice on how to stop this from happening again. I've deployed priests, given Lords the Fervent ability, built a church of Sigmar at my capital, and even issues Commandments to stop corruption. From what I can tell I've done everything correctly! But for whatever reason Chaos eventually takes everything I built. Can anyone provide some advice? Links to some good tutorials or wiki links that can explain this to me? Please help me out.