Let’s say a non skeletal corporeal undead has +2 bonus to AC when confirming a crit while an incorporeal undead has +10?

It should be address in a similar way then immunities are. If you allow criting everything you therefore should allow magic to affect anything.

This on the other hand will make your critters easier to kill. So either you lower their CR (by one per immunities lost, should be a good rule of thumb) or they need to be altered. One could add some DR or HP in the case of crits and add a DR equivalent affecting spells or HP to replace magic immunities.

My 2 cents

However do note that current rules have allowed making crit a lot more potent with feats, item qualities probably in part because a lot of creatures aren’t critable.

I would be willing to allow critability against almost all types without feats except maybe Oozes and I would ‘balance’ this by increasing HD (or HP) of non-critable creatures much like Ooze get bonus HP (not twice as many of course… maybe 20% just to make them survive a typical crit).

Definitively a subject for a mini crunch post

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.

…

I need to propose a house rule for this, I think…

I’ll post it in a bit.

See??? Even DMs who know the rules forwards and backwards forget this rule. Cast thee out, I say! Critical Hits for all!

A standard level 9 class with good will save and an 18 in Wisdom would have had a plus 13 will save bonus making the save more than 50% of the time.

A character with a weak save and a 10 in Wis gets a plus 3 bonus so he fails on a roll of 18 or less….

Yeah that sucks big time and reinforces my feeling about the monster being a more suitable challenge as a CR10 than a CR 8.

I assumed I had something closed to 5% or 10% chance of getting calmed and it seems it was more like 25% or 30%. This creature was badly design in so many aspect and its DC was another one. No wonder the others where spending action point like crazy against these…