FireLance
Legend
You know, I've been toying with something along the lines of a "Kill Defense" for monsters which, as a general rule of thumb, would be about 10 points higher than the regular "Hit Defense". If an attacker equals or exceeds this number on his attack roll, he hits a vital area and incapacitates or kills the monster outright.What about stuff like Ogre minions?
This allows PCs to effectively "minionize" monsters that they fought at lower levels when they encounter them again at higher levels. When a PC's attack bonus is +8 and the monster's Kill AC (say) is 30, he will just have to go through all of its hit points the hard way. However, when he encounters the same monster again when his attack bonus is +18, he has a good chance of dropping it with a single attack. (As a side effect, such monsters can also be killed by missed attacks, if they deal enough hit point damage.)
It's the other side of the equation that's giving me some trouble. Such monsters will not present a credible threat to high-level PCs if they don't have a high enough attack bonus, but they might be too deadly to low-level PCs if their attack bonus is too high. My interim solution requires the PCs to make a defence roll against the monster's attack (converting the "attacker rolls the dice" convention to one where the "player rolls the dice") and having graduated results, as follows (say)
Defence roll 19 or less: Monster hits for 1d10+4 damage
Defence roll 20-29: Monster hits for 4 damage
Defence roll 30+: Monster misses