At the very top of the ridge lies what I believe to be an altar of the goddess Elune. From what I can tell, we need to light the five torches in each cave, and then we will be able to access the altar directly.
I transcribed some incantations carved into the stone in the ancient ruins of Kel'Theril, which I believe are the secret to unlocking the altar. I'll need your help to light each torch, while I recite the spell.
If we are successful, you'll be able to report our findings to Erelas!
The key to success is to let Ranshalla precede you by a far enough distance to draw aggro first. If you pull the wildkin first, she will not come back to assist you, but keep walking. The wildkin range from level 56-59, so if you can handle them solo, you can certainly handle them with Ranshalla's help.
Ranshalla will travel in a roughly circular pattern around the thicket, so keep that in mind. Also, when she pauses in the caves to channel the spell, it appears that she will wait indefinitely for you to light (use) the torch. Use this time wisely to eat/drink your health and mana to full.
The quest will complete at the end of the script event and she will disappear. Return to Rut'theran Village.