D&D 5E - Barkskin clarification

It's a flat 16 AC, no bonuses, no penalties.

If you have 16 dex, mage armor, and a ring of protection, then you have 17 AC.
If you have 16 dex, mage armor, a ring of protection, and barkskin, then you have 17 AC. Barkskin does nothing.

Overall it's a pretty poor spell. Though unlike mage armor, you can cast it on someone else. Like your 8 dex paladin who lost his armor and shield.

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