How do you beat Fuse on Fusionfall

get some high lvl friends to help you and have high attack weopons for mid range

C'mon, you guys can be more specific if you want to be helpful. Or is it that you want all the drop items, because I think many people have figured it out by now.

You can solo Fuse if you have the right Nanos, but I do believe you need to be Level 36 to get the mission anyway. I take 2 Heal Nanos and 1 Freedom Nano. Fuse has the Stun, Corruption, and Eruption Special attacks. The Freedom Nano is to counter the Stun. To counter the Corruption, remember to have the right Nano out, and he'll even fuel its power -- but have plenty of potions so you can keep them summoned the entire time. You can even give your Nanos potions when their bar is zero, until they have vanished. This will cut their recovery time down.

Attacking at your furthest possible range will keep you out of reach of the Eruption Attack. You do not necessarily need to move. Be warned: as long as Fuse has his arms in his Second Phase, he can Heal himself without limit. Take out the arms first, then target the main body. I take a multitargeting gun for this purpose.

This fight is fairly easy. In some ways, fighting Bad Max and Don Doom was harder.