Prerequisites: Spellcasting or Sorcery Class Feature
When you cast a spell that has only one target and requires a spell attack roll, you can cause the spell to score a critical hit on a roll of 19 or 20 on the d20. To do so, you must expend a spell slot of one level higher than normal. If you are a sorcerer, you can spend 2 additional sorcery points to cause a spell to be an overcharged spell.
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