Mage Breaker

You have practiced techniques useful in combat against spellcasters, gaining the following benefits:

• When a creature casts a spell with somatic components within 5 feet of you, you can use your reaction to target that creature with basic shaping. The Basic Shaping will not do damage, but the damage dice calculated will be used as a concentration check against that spell. If the caster fails their concentration check, the spell fails.
• When a creature provokes an opportunity attack from you, you can use your reaction to target that creature with basic shaping, rather than making an opportunity attack