After the warning shot the nurgle cultists activate their nurgle cannons it shots theses snot like bullets landing on the small team of tanks it grows it only able to bend their cannons out of the way not completely destroyed the tanks so they still can drive But the snot releases some type of cloud it looks sickly (aka it has so much viruses in that ToT) but the people inside of the tanks should be fine if they have ventilation But they begin to see the Plaguebearers 3 million of them swarming over the tanks with their Plague Swords stabbing the tanks but it's slow and they sorta scratching it not stabbing stabbing it But anyways only way they got here because the nurgle priest finally summoned a greater daemon by using their most loyal member along with lesser daemons The map shows what's going on (BTW Plaguebearers are basically like tanks they can take alot of damage before going down and can't really feel pain)
https://wh40k.lexicanum.com/wiki/Plaguebearer If you wanna see more of them, also click or space