First-time contributor, here goes:
1) Enter the tomb and take off your gear
2) Put your pet on passive and run through the first pack, using whatever shield and self-heal you have
3) Use the Medical Probe to get yourself up again, put on your gear, buff up
4) Wait for the second pack's silver roamer and kill him (and his friend)
5) CC the Elite, kill the two silver mobs, then kill the Elite
6) Kill Averon and deactivate the prison cells
7) Profit
If you have a sprint you may be able to run past pack 1 and out of the instance (remember to take off your gear again). I usually quick travel out.