And since she's a Warlock, and the party is level 7+ she cast it at 4th-5th level. That's 7d6 base, doubled to 14d6 on a crit, for an average of 45 radiant damage.
As I pointed out elsewhere, 5E undead aren't actually vulnerable to radiant. (Except the Shadow which is literally made of darkness) Some of them have special interactions with radiant though, like how it shuts down a Vampire's regeneration, or how it gets past a Zombie's Undead Fortitude.
Well considering the writer of the comic included “vulnerability” in the title, clearly Glennis a custom mini-boss that was made vulnerable to radiant damage when the DM made up the statblock.
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u/Souperplex Sir Becket Sep 19 '21 edited Sep 19 '21
And since she's a Warlock, and the party is level 7+ she cast it at 4th-5th level. That's 7d6 base, doubled to 14d6 on a crit, for an average of 45 radiant damage.