1st Level Arcane and Wyrd Abjuration
Casting Time: 1 reaction, which you take when you see a creature within 12 sqr. (18m) of you casting a spell
Range: 12 sqr. (18m)
Components: S
Duration: instantaneous
You attempt to disrupt a creature in the midst of casting a spell. To counterspell make an ability check contest using your spellcasting ability against the target spellcasting ability. If you know the spell or the spell is from the same source as yours you have advantage on the check. On a success, the spell fails and has no effect.