Counterspell

Level 3 Abjuration Spell
Use: 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 this spell has no effect.
At Higher Levels: When you cast this spell using a spell 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 you used.
Range: 60 ft casting
Casting Time: 1 Reaction
Duration: Instantaneous
Components: Vocal, Somatic
Mana Cost: 20
Worth: 3 gp
Available Classes: Sorcerer, Warlock, Wizard