Good Luck doing it at 69. I think you will run into a dps/mana issue. Basically the portal guys come in 2 flavors. 1 is a caster (drop grounding totems) the other is melee (drop stoneclaw). No matter how fast you kill the portal guys another one spawns soon afterwards. I would think at your gear level you would need to drop some earth elementals for the 2nd boss and then have some for the third boss also. I did this a couple weeks back but I am pretty geared (+1104 sp 8.6k hp 11k armor). I would try something else. I think when I was 69 I went into shadowlabs and killed the 2nd boss for some quest reward spell damage dagger I think.