You can add your proficiency bonus to Wisdom (Perception) checks to, as a Bonus Action on your turn, attempt to predict what your opponent(s) will be doing against you on their turn(s). For the following round, until the beginning of your next turn, you gain a bonus to your AC determined by the passed DC of your perception roll:
1-9: +1 to AC
10-14: +2 to AC
15-19: +3 to AC
20-24: +4 to AC
25+: +5 to AC
(If you are already proficient in Perception, you double your proficiency bonus for the roll.)
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