5e SRD:Counterspell

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 an ability check using your spellcasting ability. The DC equals 10 + the spell's level. On a success, the creature's spell fails and has no effect.

This material is published under the OGL

Counterspell

3rd-level abjuration
Casting time:	1 reaction, which you take when you see a creature within 60 feet of you casting a spell
Range:	60 feet
Components:	S
Duration:	Instantaneous

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.

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