Go to Zek. Divide the totem at ( -409, -28, -291 ) /waypoint -409, -28, -291 by using the large axe on the wall, first one of the left in the door of the barn.
You must slay 4 Sullon centurions (37^). Kill them and speak to the shaman again. They are in the general area of the high shaman, some roam and some are static.
Return to Tychus to complete the quest and claim your reward.