Explore the village. We got an update around 4307, -1081, 1761 .
Speak to Meru at 4300, -1080, 1768 .
Use the Saltwater Cleansing ability on the sick othmir near Meru.
Speak to Meru.
Go to the tunnel and speak to one of the guards at 4133, -1081, 2217 .
Speak to Meru again. Kill the zombie othmir after they slay her.
Confront the High Shaman. Enter the tunnel and work your way through it. Some of the fallen bodies will pop up into risen othmir zombies. A bit to the north-northeast of 3921, -1138, 2377 you will get teleported out of the tunnel and back to Cobalt Scar.