Is there a reason for enemies to not use this against PCs? I worry that smart enemies would try to hack limbs off at levels well before PCs have access to magic to heal those injuries.
Sure, enemies would try to maim and mangle the PCs. And sure, there should be ways to heal such injuries. At low level, that might mean "Cleric, use a cure spell so the wizard stops bleeding. Rogue, go find his leg. I'll carry him, and hopefully the town priest can reattach it, or maybe he could enchant himself an animated wooden leg."
I'm not saying this stuff should happen often, though. And it would have to be a fairly integrated system, not something casually tacked on.
You've drifted pretty far from the point here. I understand what you're saying, it just doesn't have any relevance to D&D.I'm talking about real life. When an actual piece of shrapnel flies at your arm faster than you can perceive it, do you get to choose whether to lose your arm or not? Of course not, and that illustrates why letting the player make that decision in-game is ridiculous.
They aren't too different from what some people have described here: declare a special "combat maneuver," take a penalty to your to-hit roll, and if you succeed, you obtain a desired result.And, what are those rules, generally?
I'm talking about real life. When an actual piece of shrapnel flies at your arm faster than you can perceive it, do you get to choose whether to lose your arm or not? Of course not, and that illustrates why letting the player make that decision in-game is ridiculous.
In general, called shots work at cross purposes to the abstract HP system. If you want hit locations and specific wounds as a regular feature of combat there are systems designed to handle it.
I'm not saying this stuff should happen often, though. And it would have to be a fairly integrated system, not something casually tacked on.
Agreed. You want to make mincemeat of the monsters. The monsters will make mincemeat out of you. My group used to used the "good hits and bad misses" chart from Dragon #54(number maybe wrong). Until one night we had two dead pcs, one cripple, and one missing either an eye or arm. So called shots in general for D&D no. With the exception a special monster aka Beholder.If a player wanted to make call shot to cut off a body part I would ask them if they really wanted those rules in the game since monsters would now be able to do that same thing.