Doomsday Tower Defense: All N Cards Must Be Upgraded to SSR

[Card] + [Apocalyptic Evolution] + [Tower Defense] + [Multiple Crowd Portraits] + [No CP] [Updated at 0:00 every day, please support! ! On January 1, 2100 AD, the φ (fai) virus broke out around the world. After being infected, a large number of humans, animals and plants mutated and turned into heterogeneous species. Human society suffered a huge survival crisis. Li Feibai was reborn one month before the apocalypse. In addition to having memories after the apocalypse, he also had twelve cards made of special crystal materials in his hand. Each card has a pattern inside, and all are N-level cards. He must find a way to upgrade the cards in his hand before the end comes, so that he can summon the powerful Kaling to help mankind defend the last line of defense. Each card has different attributes, and the upgrade conditions that need to be met are also different. If all twelve card spirits are successfully summoned, an indestructible protective shield will be formed, and humans will be able to build cities within the protective shield and continue to thrive. There is one thing to note: if the upgrade fails, there may be a backlash from Kaling! So if you want to upgrade your cards, you'd better make yourself stronger first! …… In the end, Li Feibai not only upgraded all his cards to SSR, but also became the city lord of the largest city-state in the entire human world. He is truly the strongest person in the world!