So Phil, the ChattyDM, chronicles a battle over at his site wherein he forgot about a plant creature’s critical hit immunity, and let it slide as a “nice DM” bonus.
Dave: the Game commented on it
See??? Even DMs who know the rules forwards and backwards forget this rule. Cast thee out, I say! Critical Hits for all!
and I began a mini-rant, which I shall continue here.
The way I figure it, plants, oozes and constructs are a minority of what we fight in D&D. The only crit-immunes that are very common are undead.
But most undead, IMHO, should be crittable anyways. Has nobody seen the lucky headshot in a zombie movie? Or the stake to the heart in a Buffy episode? With the possible exception of skeletons and incorporeal undead, most undead are shown as having more damaging areas.
So why not allow crits for everything?
And don’t say to balance rogues. A rogue’s job is to get in, strike quick, and do good damage. Crit-immunes don’t balance rogues, they nerf rogues for that encounter. Same as a golem’s magic immunity does to casters.
Now, being useless for an encounter is no fun.
Similarly, scoring a natural 20 (ankle bite or not), and not being able to use it, is also no fun.
Yet for some reason, some people don’t want to throw out crit-immune creatures altogether. So it seems a house-rule compromise is necessary.
Well the compromise between crit-immune and nothing is crit-resistant. But we have no mechanic for crit resistance, so that’s what we’re going to need to devise.