Vorpals and spells?

Bheleram

Active member
So vorpal is a natural 20 on an attack roll. Meaning you have to roll for a hit with a weapon for it to trigger. Which suggest that you can't vorpal with a damaging spell?.. Or can you? I am confused since spells can crit too.
Wondering whether fate singer's vorpal epic enhacement would work on a spellcaster.
 
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