38
Definitely not the most AC you've seen, but I felt proud of hitting this on Tactician 😁
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Baldur’s Gate 3 is a story-rich, party-based RPG set in the universe of Dungeons & Dragons, where your choices shape a tale of fellowship and betrayal, survival and sacrifice, and the lure of absolute power. (Website)
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Each "image" of Mirror Image gives you a +3 bonus to AC (there are 3 images, for +9 AC total). When an attack misses, one of the images disappears. It was handy for dodging Myrkul, who couldn't get a scythe attack in.