Anon used the wrong spell. The right one is Lesser Restoration.
> Greentext
> Nat 20
> The spell fails anyway because (a) congenital disabilities aren't wounds and (b) crits only apply to attacks to begin with
Also no healing spell requires an attack roll. In 3rd edition there were some spells that were Save (Harmless) that you could choose to try to make a saving throw to resist them. Once I was playing an Athar who would resist any spell granted by a deity but it was me rolling the dice not the caster.
I've seen many a game have a "absolute success/failure" rule.
Makes for good stories usually.
“Ranlar with no experience walking let alone running falls to the ground immediately”
Cast Animate Object on the wheelchair and make it spin in place as fast as possible for the entire spell duration. Weeeee!
"Anon doesn't actually play DnD and just made it up like every other greentext"