Enhanced Defense

D&D 2014 optional feature: Enhanced Defense. Source: Tasha's Cauldron of Everything. feature type Artificer Infusion A creature gains a +1 bonus to Armor Class while wearing (armor) or wielding (shield) the infused item. The bonus increases to +2 when you reach 10th level in this class. Artificer Infusion

Source: Tasha's Cauldron of Everything, p. 21 - Licenses and attribution