Magic Armor Abilities - Spider Bound

Once per day, you can speak a command word to cause your shield to transform into a fiendish spider. The spider's size depends on the type of shield, as shown on the following table.

ShieldFiendish Monstrous Spider Size
Light shieldMedium
Heavy shieldLarge
Tower shieldHuge

The spider follows your mental commands. It remains for 10 rounds or until reduced to 0 hit points, at which point it instantly reverts back to a shield. While the spider is activated, you lose your shield bonus to AC.
Aura: Strong; (DC 21) conjuration
Caster Level: 12th
Requirements: Craft Magic Arms and Armor, Summon Monster I (buckler), Summon Monster II (light shield), Summon Monster IV (heavy shield), Summon Monster VI (tower shield), drow.
Price: +2,500 gp (buckler), +5,000 gp (light shield), +10,000 gp (heavy shield), +15,000 gp (tower shield)
Cost to Create: 1,250 gp, 100 XP, 3 days (buckler); 2,500 gp, 200 XP, 5 days (light shield); 5,000 gp, 400 XP, 10 days (heavy shield); 7,500 gp, 600 X
Drow of the Underdark

About Magic Armor