I posted this in the VS forum a while back:
Some of Seth's powers, off the top of my head:Super strength(above Apollo-with-a-heavy-charge level), indestructibility, speed/reaction time, etc. He could overload an opponents mind with a single massive thought, he could make someone feel what it was like to be an animal or person dying in a horrible fashion, he could teleport, he had some kind of energy burst that burnt the hell out of Apollo (who survived a trip into the sun, and a trip near the Earth's core), could spit up razor blades that cut deep into Hawksmoor, who has some pretty high durability.
That's all I have right now. Basically, his biggest selling points are his indestructibility (survived several heavy blasts of Apollo's heat vision, and having a jet plane slammed right into his chest followed immediately by an antimatter explosion), the weapons designed to take out high level super people and his psychic attacks.