Mage Armour: "The target’s base AC becomes 13 + its Dexterity modifier" meaning the spell is a distinct AC calculation from natural armour, kind of like how barbarians can't simultaneously use Unarmoured Defence AND get a bonus from medium armour.
Shield of Faith: "A shimmering field appears and surrounds a creature of your choice within range, granting it a +2 bonus to AC for the duration" so that should work with any sort of AC calculation because it's just a bonus. This much definitely checks out

So if bears have a +2 dex bonus, and I don't think they do, 17 would be correct. Otherwise the game isn't properly differentiating between natural armour & mage armour as separate armour class calculations.

Last edited by Koshchei; 27/02/21 02:23 AM.