Avoid Taranis Gazerra at the beginning, it is the final boss and you cannot kill it yet.
Clear trash, take south-east path up.
Kill Beam Handler Val'Kinad: When mob gets immune, click the energy beam machine on the wall to move it into position, then move mob into the line of the energy beam to make it vunerable. When emote is shown 'handler is casting a powerful spell', run far away to avoid getting 100k/tick curse.
Continue to Technomage Grid Mechanic and kill him outside the laser room. The lasers hit for 300k each, so in order to pass safely you must use the 8 mirrors in the previous room and place onein each of the glowing blue boxes in the room.