Armor Class (Rules) (Player Core)
Your [[compendium:rule:Armor Class]] (AC) measures how well you can defend against attacks. When a creature attacks you, your [[compendium:rule:Armor Class]] is the DC for that attack …
Your Armor Class (AC) measures how well you can defend against attacks. When a creature attacks you, your Armor Class is the DC for that attack roll. Use your proficiency bonus for the category (light, medium, or heavy) or the specific type of armor you're wearing. If you're not wearing armor, use your proficiency in unarmored defense.
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