Rules:

Battle happens in an indestructible planet. No BFR. Everyone is bloodlusted. Perfect teamwork. All Green Lanterns are at standard pre-new 52 levels. Who wins?

This matchup will be decided on whether or not they can stop Fernus' TP Assault. Without that special guardian tech, I'm not sure they can, unless I'm missing some heavy TP resistance feats from each Lantern.

Fernus turns their minds into a toilet

I remember that every Lantern has some form of basic TP resistance, but it's not enough here.

Manhunter without his Fernus buff has already gotten into the minds of multiple Lanterns, including Hal himself, and messed them up pretty badly. With his Fernus feats included, they don't stand a chance of resisting it here.

Fernus.

Fernus. Telepathy resistance isn't cumulative and the team's resistance is inconsistent.

The team gets mindwrecked.

Fernus.