Brutal Caster

Your magic is brutal and unforgiving for those unfortunate enough to be on the receiving end of it. Your spells and cantrips gain the following benefits.

• If a damaging spell or cantrip is a ranged spell attack, it will critically strike if you roll an 18 or higher naturally on the d20 to hit. 
• If a damaging spell or cantrip requires a saving throw, and a creature rolls a 2 or below (and fails their saving throw as a result) on the d20 for their saving throw, they take twice as much damage as they normally would from the spell.