Yarasule

Yarasule is Obi Wan Kenobi. They are their generation's Exemplar.
For a time, they trained Child of Dhermot (aka Teren), until they had a falling out. Child of Dhermot didn't want to follow his destiny and probably hasn't fully developed his power at this point.
They have a demiplane of their own creation that they use to keep themselves safe.
They love to create trinkets, magical amulets, even minor boon tattoos.
They say they need our help - maybe the baddies are somehow getting their hands on powerful Free Magic

What do you know about the Raven Queen? Have you interacted with her in the past?
Lolth is likely connected to the Drow attacks and the stealing of elf children. What do you know about her intentions and ambitions?
I'm glad you are coming back to the world to help figure out what's going on with your protege - how can we help? Aside from the telltale necklace, are there any other things we should look out for to find them?
Do you think Child of Dhermot (aka Teren) would have left for the Feywild?