Spell Echo

By mimicking the verbal components of spells you witness casting, you can attempt to cast these spells for yourself. You gain the following benefits:

• Increase your Intelligence, Wisdom, or Charisma score by 1, to a maximum of 20.
• You have advantage on ability checks made to determine whether or not a sound is magical in nature, such as illusory audio or the spoken incantation of a spell.
• When a creature you can see and hear within 60 feet of you casts a spell, you can use your reaction to make an Arcana check using the ability you increased with this feat, with a DC equal to 10 + twice the level of the spell that was cast. This check is made at disadvantage if the spell has any non-verbal components. On a success, you learn the spell as if it were on your class' spell list, and you can cast it at its lowest level once per long rest without requiring a spell slot. If you are not a spellcaster, use the ability score you increased with this feat as your casting ability for these spells. You can have a maximum number of spells copied in this way equal to your proficiency bonus; if you successfully learn another, you must choose one to replace with the newly-copied spell.