On leaving Teyn to the west, go south at the first dirt road connecting to the main road. Walking down the southern road a little bit, Sebarmul is just off the road slightly and it's the first marker on on the local map, just off of the road, easily passable since it's kind of hidden behind a rock from the dirt road.
There's a couple basic enemies in here, and of course the quest objective, Athryn Llendo, right after a small, thin ramp downwards in the cave. Near Athryn Llendo in a couple nearby chambers in the cave, there is some raw Emerald veins to be looted, but nothing else of note in this cave.
Climb out of the cave and make your way back to Rojanna Jades at Fort Ancylis.
Sebarmul is not far from Teyn, being in the same cell - reach it by leaving Teyn on the west road, turning left onto the dirt track, and keeping an eye out for the entrance on your left.
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