You create a shelter of slightly sticky webbing. You may create a hemisphere with a diameter of between 5 and 20 feet or a sphere with a diameter of between 5 and 10 feet. The shelter has a hinged door large enough to accommodate a Medium creature. The opaque walls of the shelter measure 1 inch thick and provide total cover to anyone within it.

Creatures other than the caster - and those designated by her at the time of the casting - touching the web shelter become grappled by the sticky fibers and must make a Combat Maneuver check or Escape Artist check as part of their move action, with a DC equal to the spell's DC, or remain grappled.

The shelter is watertight and insulated with the door closed. Its surface has a hardness of 0 and 2 hit points for every 5-foot square of web surface area. It takes normal damage from fire (not half damage like most objects) and burns as easily as wood. When the spell ends, the webbing decays rapidly and disappears.