Note: Dryad only spell.
Those dryads who were shaped by a dragon overlord's actions can automatically endure the environment that they were "shaped" in. However, their traveling companions often succumb to the extreme heat, cold, or other conditions that prevail in a dragon overlord's realm. Whenever a shaped dryad accompanies another through her home "shaped" terrain, she can "toughen" her companion for a time by using the spell endure environment. This spell negates any harm that a hero might come to while traveling through an overlord's terrain for as long as the duration lasts. However, it does not prevent harm caused by extreme heat or cold (such as burning oil or a magical blast of ice).