The Mage Armor spell has been cast on you, and a protective magical force surrounds your 8 hours. While the spell is active your base AC becomes 13 + your Dexterity modifier. The spell ends early if you don armor or the caster dismisses the spell as an action.

Disclaimer: This item is meant to simulate the effects of the Mage Armor spell and does so in a complex way. The item changes the armor calculation for an unarmored character from 10 + Dexterity modifier to -10 + 13 + Dexterity modifier. So the calculation will not work for and should not be used with characters that have the natural armor feature.

Notes: Bonus: Armor Class, Bonus: Armor Class