Nexus defeated in 2 minutes and 41 seconds
here are some tips for this bossfight:
in his first phase, switch the flamewalker to One of the other 2, both are good against him, flamewalker in the other hand....
always try to... "parry"? his attacks, it causes great damage and he Wont use it.
channelers are op in everything.
kara and paragon are very good against this guy.
always have the turtle NEAR Nexus, but not to NEAR because of the energy BALLS.
never EVER waste time with the ice things.