Monstrous Compendium Vol. 1: Spelljammer Creatures
Frozen Sick
D&D Beyond Basic Rules
Basic Rules (2014)
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Monstrous Compendium Vol. 1: Spelljammer CreaturesFrozen SickD&D Beyond Basic RulesBasic Rules (2014)Sign in to view your library & saved favorites.
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Similarly, the Breastplank shows a +1 at the Uncommon, Rare, and Very Rare levels, but it gives no bonus to the AC when a character equips/attunes it.
https://www.dndbeyond.com/magic-items/9787725-breastplank
Pages for the Breastplank at different rarities indicate no AC bonus, and that section in the book shows no pluses. So I'm guessing it's just the main magic item pages that are wrong, and neither of these items were meant to give bonuses.