You have devoted a significant amount of time to studying the biology of the beings that inhabit your world, learning just what makes them tick--and being an adventurer constantly thrown into life-or-death situations, you've figured out how to exploit your knowledge.
Choose two different categories of monster. Whenever you encounter a monster in battle, you can use your turn to roll a DC 11 religion (celestial, fiend), arcana (aberration, fey), or nature (any other category of monster) check. On a success, you can add your intelligence modifier to either your AC or attack rolls against this species of monster until the end of the battle.
If the monster in question belongs to one of the two categories you chose, you make your roll with advantage.
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