Just a quick question. If you take the ambidextarity advantage can you attack and counter attack without chosing an extra action? Also, If one has the Kempo martial art and abmidextarity and take extra actions, would you have two attacks at minus 10, then two at minus 20...etc?

With Ambidexterity, you get one extra off-hand attack at -5 instead of the usual offhand penalty. After that, you don't get any more bonus attacks, nor are they all double attacks. It just adds one offhand attack at -5 to your first action (attack).

For example, if you were ambidextrous, and had 3 active actions because of dex+agi, and wanted to use all 3 as attacks, you would get 4 total attacks:

1 - attack / attack -5
2 - attack -25
3 - attack -50

Counter attacks require one action from you, so if you were entitled to a counter on your initiative, you could choose which attack to use for it (your 3 main, or your offhand attack).

If you wanted something like a two-weapon combo whirling cuisinart of death, you would probably need to add a melee Domain to ambidextrous.

hellgeist said:

Doesn't work like that.

ALL of your attacks count as ONE action.
EACH active action (like attacking) can be done only ONCE per turn. Though this action can be subdivided into several ones.

Thus : if you have 3 active actions because of dex+agi, only one of those can be an attack. Meaning it won't be "attack 0 / attack -25 / attack -50"

To be able to make SEVERAL attacks as part of a SINGLE action into several, you need to :
- use 2 weapons : main weapon is at +0 , off-hand weapon is at -40 (or -10 if ambidextrous)
- have a high enough Attack : you gain the ability to make 1 extra attack for each 100 in Attack, with a penalty of -25 per attack to all of them.
- buy a weapon module that grant an extra attack
- use a technique
- ...

Example 1 - two weapons :

You have an Attack score of 150, and wield 2 weapons.
You can attack with main hand at 150 & attack with off-hand at 150 - 40 = 110 <-- Note it counts as only 1 action

If you have ambidexterity, it turn into attack with main hand at 150 & attack with off-hand at 150 - 10 = 140

Example 2 - multiple attacks :

You have an Attack score of 150, thus can make 2 attacks ( 1 + 1 for attack > 100 )

You can :
- attack only one time at 150
- attack two times at 150 - 25 = 125 <-- Note it counts as only 1 action

Example 3 - combining the above examples :

You have an Attack of 150, and wield 2 weapons.

You can :
- attack once with main at 150 & attack with off-hand at 150 - 40 = 110 <-- Note it counts as only 1 action
- attack twice with main hand at 150 - 25 = 125 & attack with off-hand at 150 - 25 - 40 = 85 <-- Note it counts as only 1 action

Example 4 - same as example 3, but adding extra actions :

You have attack 150, wield 2 weapons, and have enough dex+agi to declare 3 actions

You are on a roof, and an opponent is on another roof, across the street

You declare that you will Run (1st action), Jump on the other roof (2nd action) and attack (3rd action) :

- you run to the ledge of the roof : fine, no problem
- you jump at -25 as it's your second action this round) : let's say you make it, for the sake of the example
- you attack with all you have (2 main hand attack + off-hand attack). Because it's your 3rd action this round, your Attack is reduced by -50, to only 100. You make your main hand attacks at 150 - 50 (for 3rd action) - 25 (for two attacks) = 75 .
Then you make your off-hand attack at 150 - 50 (for 3rd action) - 25 (for two attacks) - 40 (for off-hand) = 35

hellgeist said:

No, counter-attacks require an attack

I assumed that it was already known that your attack can break out into multiple combat actions.

No need to make it more complicated, just acknowledge the assumption for the sake of discussion, or put the word 'attack' in front of every instance where I stated 'action' and it makes sense again.

All right, sorry, just wanted to correct your example.

As for the OP, kempo reduced the penalty from extra attack to +10 instead of +25.

If your were allowed to make 3 attacks, with kempo you would be at -20 / -20 / -20, instead of -50 / -50 / -50

When fighting unarmed or with martial arts, you can't get an extra off-hand attack, so ambidexterity would be useless.
It is assumed that you are already fighting with fists, feet, knees, etc... so you can't get that off-hand attack