I can't believe there was such an easy method to beat this (Shadow Plague)
Okay, after i bought the Shadow Plague i tried like, dozens of times to beat the game with it, i first tried classical stealth mode a couple times which obviously brutally failed. Than, i attempted to collect DNA points by crossing the entire bat as a bat and stealthily infect everyone via vampire couple times too, which also failed because no matter what they find you and the disease at some point. Than i tried to collect diseases via creating caves just like i did in ape flu to win a handfull of times, which also failed. Than i tried to play like necroa virus where i just release shadow slaves early about a few times, which also failed. Than i tried to beat it by having multiple vampires, which again also failed. No matter what i do it doesn't work. No matter how many lab i destroy the cure research at some point gets completed super fast and because Templar Fortresses certain countries doesn't get infected. And trying to eradicate fortresses doesn't work because they instantly ratio my vampires.
Today, meanwhile messing around, i wanted to spend all my points to vampire himself rather than the shadow plague to see what happens and didn't touch anything else. And when playing i realized Templar Fortress actually aren't invincible like i thought. I realized in my previous gameplays just didn't upgrade the vampire fast enough. I simply destroyed every fortress before any of them got too strong. And after i destroyed all of them not anymore templar fortress got summoned and the world became entirely defensless. I eradicated Greenland and İceland via demonic fury, and meanwhile doing that i realized how many DNA points i got. Than i went to the China, released a shadow fury in there and waited a couple of minutes for vampire doing a massacre in here, and now i had more than 500DNA points. I increased the therianthropy to max, gave him the shadow portal, made caves across every continent, released the shadow slaves, developed all the resistances, and develop all the infection way. Than of course i won the game.