Magic Item: The Cobra King's Warding

The Cobra King's Warding: Sometimes found in an ordinary potion vial but most commonly stored in small flasks of amber glass stoppered and sealed with wax, this emerald green draught is effective only when the inbiber is wearing no better than chainmail.For the next hour, the draught grants a magical +4 bonus to the imbiber's Armour Class – but for the duration and an hour afterwards the imbiber