Prerequisite: must be able to cast spells from spellslots gained through a class or subclass
You've learned or encountered all sorts of magic along your journey, from the simple castings of mage hand to move books to explosions evoked from the Fireball spell.
You gain a special reaction that does not use up your normal reaction per round. This reaction allows you to attempt a identification check when a spell is being cast with a bonus equal to your spell casting modifier plus your proficiency bonus. Upon passing the check (DC=10+2 per spell level. ex: a level 1 spell would require a DC 12 check), you know of the potential effect/s of the spell, its school of magic, and a +1 bonus to AC or saving throws against the spell.
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