The frost druids have always been a mysterious and hostile force within the tundras of Icewind Dale.
For ages they were thought to be little more than solitary defenders of nature. Usually they would patrol their territories in the guise of an arctic fox, a mountain goat, a snowy owl, or a wolf, reverting to human form only when it attacked.
Others were more aggressive and were known to appear now and then and cause trouble for the peoples of Ten-Towns, pursuing their goals of preserving the arctic wilderness by destroying outsiders who cross their path. These more aggressive druids were known to be clever ambushers, using hallucinatory terrain spells to create illusory snowdrifts under which they can hide. Others disguised obscure pools covered by thin ice through which others might fall.
Regardless, the druids were never particularly organized and rarely ventured outside of their grottos. That is until the Everlasting Rime began in Icewind Dale.