Roll to Cast, Critical Casts and Miscasts

When a natural 1 is rolled, the magician’s spell is critically miscast and breaks the real. Breaking the real replaces the spell’s normal effect with whatever weirdness breaks through from beyond. Other effects might trigger off a critically miscast spell as well.

When a natural 20 is rolled, the magician has critically cast the spell. Any mana spent to cast it is refunded. Other effects might trigger off a critical cast as well.

Breaking Concentration