Talk:Hecate Nocturna/@comment-34461919-20180818153225/@comment-30245256-20180818230219

Well, it wouldn't be resistance, as there is a resistance measure in 3.5e, and that reduces the damage one takes from a certain type of damage, it's a flat out immunity, as in they cannot be affected in such a way, additionally, Vecna's profile is specifically noted that he can deal critical damage.

https://vsbattles.wikia.com/wiki/Vecna

So it is feasable that it has some merit.