Hydaelyn

You invoke the spirits of nature to protect an area outdoors or underground, creating a magical ward that can be as small as a 30-foot cube or as large as a 90-foot cube. The warded area is heavily obscured by solid fog, filled with grasping undergrowth, animated grove guardians, and can include additional magical effects like gusts of wind or spike growth. Creatures specified as friends or those who speak a password are immune to these effects, and the ward lasts 24 hours or until dispelled, with each effect removable individually by dispel magic.