You attempt to interrupt a creature in the process of casting a spell. If the creature is casting a spell of 3rd level or lower, its spell fails and has no effect.
If it is casting a spell of 4th level or higher, make a contested ability check using your spellcasting ability with the creature, who uses its spellcasting ability. Add your proficiency bonus and the spell slot level used to cast this spell to your total. The creature adds its proficiency bonus and the spell slot level used to cast its spell to its total. If your total is higher than its total, the creature's spell fails and has no effect.
If you have a feature that grants you proficiency with Counterspell, you may add your proficiency bonus a second time. Alternatively, if you have a feature that grants you expertise with Counterspell, you may add your proficiency bonus a three times.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the interrupted spell has no effect if its level is less than or equal to the level of the spell slot you used.
* - which you take when you see a creature within 60 feet of you casting a spell
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