Your warlock portal makes interrupting him pretty easy. Have your lock click the first switch. Then port up top. Rain of fire the snakes that are on the rest of your group if possible.

Have one of your other dps click then 2nd switch soon as you get those 4 there. Be killing the adds with your Tank + Healer + 1 Dps + Lock Rain of Fire from above.

After 2nd switch is down finish off the snakes the best you can and make your way to the stairwell. Use the lock to interrupt the boss and then get to the stairwell... Finish up any snakes that are left before the boss gets there.

This boss is definately not easy. I'd suggest you farm Vortex Pinnacle, SFK, BRC to get your gear up first.