I just want to know who would make Nekron less of a pain to beat. I already use infinity wars sinestro with his ability to counter quintessence.

Well the green battery for starters in a game like that. I have Necron, and i have played a few epic battles with him. There is a Thanos peace that doesnt allow healing that was always a pain for my Black lanterns. However i find the funnest way to combat a collosal like that is to bring your own. My Necron has taken a few down but Galactus destroyed him quick. The Superman robot is awesome two such a sweet collosal figure.

Similar thread from a few weeks ago has some good ideas.