Armor of the Viper (revised)

You have a +2 bonus to AC while wearing this armor. Additionally, when a creature hits you with an attack, you can use your reaction to force the creature to make a DC 16 Constitution  Saving Throw. On a failed save they take 4d10 poison damage and are poisoned until the end of their next turn, if they succeed they take half the damage and are not poisoned. You can use this feature three times per long rest.

Made from tough but flexible leather, studded leather is reinforced with close-set rivets or spikes.

Notes: Bonus: Armor Class, Poisoned, Combat, Warding