How about a new villain created specifically for the fanfiction? A being made up of the combined negative energy from all the spider - verses. This entity could be called the 'Void - Spider' and it feeds on the chaos and destruction that often follows Spider - Man in his battles. It would be a very powerful and unique threat that the Spider - Men from different universes would have to face together.
The best chapter pointer here is Chapter 234, "Chasing Wind Youth". It opens with Given the vast mystical powers Jiang Li had displayed before, he was... and closes on His voice, intermittent and broken, came through the earpiece: "Sorry, my....
Look to Chapter 223 for the clearest answer. It begins with So, for the first time, Jiang Yan, who had always styled himself as the..., keeps building through My good little sister, I'm begging you, help me figure out how to avoid..., and lands on The damned Jiang Li was tricking him again!.
Chapter 226 is the strongest chapter-level answer because it starts from What was all that before then? and follows through on Are you sure you can be on the list of winners?] Zhou Xu: [?.
Chapter 192 is the strongest chapter-level answer because it starts from Jiang Shixu had never imagined that Jiang Cheng, who had been so arrogant... and follows through on Jiang Li responded with a detached "hmm" from the other end..
Chapter 187 is the strongest chapter-level answer because it starts from During the competition, she passed by him numerous times, unfazed by... and follows through on Perhaps it was a pig that tripped you; they are quite aggressive, after....
Chapter 195, "Bizarre", is the clearest early answer because it turns Nie Siyan's situation into a concrete plot event. The setup is If this wasn't an imitation by someone, Wang Tao felt there was a..., but the pressure keeps building through He had previously encountered a Black Mist Monster in Shuize County.... Once the chapter lands on Then a bald man with tattoos on his face burst out., the chapter closes with "Could it be...
The best chapter pointer here is Chapter 178, "The Group's Favorite Belongs to No One but Her!". It opens with Wen Jiaojiao is just too unreasonable, why does she have to single out... and closes on Let's not even mention President Shang's own net worth, but talk about his....
A practical answer is Chapter 170, because it turns the idea into a concrete scene. The chapter opens with Watching the two who had long remained silent, the PD shifted his position..., adds pressure through I really want to see the chaotic scene!], and ends on [Didn't the other guests also do.
Chapter 219 is the strongest chapter-level answer because it starts from Qi Tianyu was somewhat freaking out. and follows through on Having any yield at all was already the show giving them face..
The best chapter pointer here is Chapter 238, "The Guests Were Dumbfounded, The Audience Was Excited". It opens with Jiang Li was actually first on all three leaderboards?! and closes on And, to Zhou Xu's alarm, they did find a problem..