Spell Mirroring

Your mimicist tendencies evolved to gain arcane properties, granting you the following benefits:

• Ability Score Increase. Increase your Intelligence, Wisdom, or Charisma score by 1, to a maximum of 20.
• Mirrored Spells. When you see a creature within 60 feet of you casting a Spell that includes you as a target of its effects, you can use your reaction to learn and instantly prepare it, provided it is of a level for which you have spell slots. You can forget a spell learnt by this way when you use this reaction to learn another spell, or as an action on your turn, and all the mirrored spells are forgotten when you finish a long rest. You may have a number of mirrored spells equal to or less than your Proficiency Bonus, and their combined level must not exceed the modifier of the ability you increased by this feature. Your Spellcasting ability for those spells is the same you increased by this feature.