Juggernaut (8th day) durability test
Cain will stand there and take 10 all out punches from the following characters. Who can make him bend over? His feet are magically stuck to the unbreakable floor beneath his feet.
They can amp their punches, or whatever, but they are giving it their all.
Superman
Blue Marvel
Thanos
Silver Surfer
Black Adam
Hyperion
Doomsday (Pre 52)
WW Hulk
Sentry (Pre Siege)
Wonder Woman