Two Weapon Rend

[drnuncheon]

In your opinion, an AoO is a "regular attack"? (!)

I'm not sure what to say to that...

No, an AoO uses the same bonus as your regular attacks. Your regular attacks that round have a -2 penalty each. Since the AoO uses the same bonus, it too gets a -2 penalty.

When you attack with two weapons in one action you get certain penalties. If you attack while prone you get a certain penalty (-4). If you attack an stunned opponent you get a certain bonus (+2).

These bonuses and penalties all depend on the specific situation, and if that situation no longer exists (you are making a single melee attack, you have gotten up from prone, the opponent is no longer stunned) the penalty or bonus is also gone. Even if you had that bonus or penalty on (all) your attack(s) during your turn.

It is my belief that if you choose to use two-weapon fighting, it lasts for the entire round - thus, the situation still exists. Since there is nothing conclusive in the PHB either way, it comes down to a DM judgement call.

I make my call based on similar abilities - all other feats and abilities that grant bonuses or penalties to all of your attacks count for your AoOs as well. The monk's flurry of blows (which operates identically to 2WF + Ambidexterity) lasts for a full round - they get the penalty even though they're "not flurrying" when they make the AoO.

How do you rule on Off-Hand Parry (from Sword and Fist)? That feat lets you sacrifice your off-hand attacks for a dodge bonus to AC - but you still take the 2WF penalties. Obviously when you use this feat you are effectively "fighting with two weapons" - so do you only get the benefits of the feat while you are actually making the Full Attack action, making it useless? Or do you take the +2 dodge bonus and the -2 to all attacks until your next action, which makes far more sense?

Even if the PHB is not as explicit on the topic as it is for Expertise or Power Attack, the preponderance of the evidence points to the ruling that the effects of 2WF last until your next action.

J