A druid who supposedly can be found currently in the ruins of the old village of Thundertree. Qelline Alderleaf is certain the druid will know either where Cragmaw Castle is or possibly the location of Wave Echo Cave, “since there’s not an inch of the land he doesn’t know.”
Reidoth had regularly visited Thundertree, aiming to clear the zombies, twig blights, and spiders that had corrupted the town, although with limited success. He entreated the party to aid him particularly in driving out the dragon which had taken up residence. When the party engaged the Cult of the Dragon and appeared to align with them, Reidoth declared that he couldn't condone this - and whilst he was too weak to prevent the party himself, he wildshaped into a squirrel and fled the town.