User blog comment:Lasifer/No Hope for Mother Earth: The Reapers vs. Giygas (Collab w/ Beast)/@comment-5522042-20131229003056

Utter noob's "Jesus in the Walking Dead?" edges:

Giygas vs Sovereign
Weapons/Abilities-Giygas. Sovereign is limited to only a railgun and Hades canon. Despite both weapons being devastating, he has few options and can quickly become predictable. Considering Giygas' access to the Apple of Enlightement, he will have the chance to study Sovereign and his forces before going into battle. PSI Rockin', PSI Flash, and PSI Thunder will not only do severe damage to Sovereign, but also take some of his army. Finally, the Devil's Machine can reflect Sovereign's attacks back at him. Even if the Devil's Machine does get destroyed, the outcome will likely do more bad than good considering the massive increase in power Giygas recieves. Edge Giygas

X-factors-Giygas' immense power gives him the edge here. Although Sovereign is far from weak, Giygas is nigh omnipotent and might be able to kill Sovereign with one or two attacks. Edge Giygas

Winner-Giygas. His pure power and ability to see the future is what leads him to dominate Sovereign.

I'll do the rest later.