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Notes
Based on
1. Sneak Attack as a Standard Action
2. Sneak attack - weak spot - immunities
3. Sneak Attack and Knowledge checks - p. 23
4. Previous version: here
This is very much a work in progress. I'm toying with the idea of allowing non-rogues to deal extra damage to types of foes they have studied. I'm using the Knowledge rules discussed elsewhere as the basis for the feat.
New rule
Feat: Sneak Attack
You learn to identify your opponent's weak spots and to strike them for extra damage.
Prerequisite: BAB +1, relevant Knowledge training (at least 1 rank) or Heal 1 rank
Benefits
You select one of the following skills.
Heal: humanoids
Knowledge (arcana): constructs, dragons, magical beasts
Knowledge (religion): undead
Knowledge (nature): animals, fey, plants, vermin, monstrous humanoids
Knowledge (planes): outsiders, elementals
Knowledge (dungeoneering): aberrations, oozes
If you can catch an opponent belonging to the creature type covered by the selected skill when he is denied a Dexterity bonus to AC (whether the he has a Dexterity bonus or not) or when you flank him, you can give up all your attacks to perform a single attack at your highest BAB to strike a weak spot for extra damage. If you score a critical hit with your attack, this extra damage is not multiplied. Ranged attacks can deal extra damage only if the target is within 30 feet.
See the table below for the amount of damage you deal on a successful attack:
BAB | Damage
--------------
+1 to +5 |1d6
+6 to +10: 2d6
+11 to +15: 3d6
+16 to +19: 4d6
+20: 5d6
You must be able to see the target well enough to pick out a weak spot and must be able to reach such a spot. You may not sneak attack while striking a creature with concealment or striking the limbs of a creature whose weak spots are beyond reach.
In order to identify a target's weak spot, you must have the specified number of ranks in the relevant Knowledge skill. Your knowledge check is always assumed to be 10 + relevant Knowledge skill ranks (including the +3 class skill bonus). The DC of the check is 10 + 1/2 of the target's CR. For instance, a cleric with 1 rank in Knowledge (religion) (a class skill) may sneak attack CR 1, CR 2, CR 3 and CR 4 undead.
You may not use the Aid another action to gain a +2 to the Knowledge check result or to provide another character with such a bonus.
You can gain this feat multiple times. Its effects do not stack. Each time you take the feat, choose a different skill.