As the World Burns
Amulet of the Spider
At present, this item allows the wearer to spider climb 2/day. The Amulet of the Spider is quite old, and its magic is unreliable. Activating the amulet requires a DC 23 UMD check, or, if the spell is one you could normally cast, a caster level check against a 3rd level caster (DC 14).
Should the check fail, the item instead summons a spider swarm into the amulet’s location, as per the spell. This does not include the ability to control the spiders.