I saw some controversial forum posts here about Summer of Pain Mysterio and this is why I want to share these Solos done by very general champs:
1) First Solo was with Guillotine 99 - took 14 minutes..
https://youtu.be/JTlriLUriaQ 2) Second was with Star-Lord - took fewer hits than Guilly 99 but took more time, almost 16 minutes.
https://youtu.be/BS4dg6W72Lw 3) Third is Proxima with - 11 Minutes...
https://youtu.be/Wr1WPCUYQSgGuilly 99 is the easiest though because of her power control on special 1, regen, and high block proficiency.
BTW I also tried Aegon
https://youtu.be/HGreT6PcGKc but definitely not recommend using him at least compared to these 3 champs.