This is a difficult mission. We tried with a non-raid geared tank, and he didn't last long at all. Came back with a raid geared tank and we beat the first boss. Adds are a problem when the boss spawns, so we burned on waves 2 and 3 (ancient iksar and haulers) so that we had less to deal with. Even so, when it came to the 2 guardians, our raid geared SK couldn't handle it. We had to use creative pulling to separate them and tank them one at a time. There were multiple almost wipes. We were able to rez and keep going, so there is no timer that forces you to engage right away.