Based on a comment I made in the T. vs. D. thread.
So, at the college reunion at Hell University, Trigon's kids (Raven, 6 sons - he does have more kids though but just these) and Darkseid's (Kalibak, Orion, Grayven) drink too much beer and start talking smack about each other's dad.
A fight breaks out - who takes it.
Orion is a powerhouse, might he just take everybody down?