How does Multiweapon fighting goes to improved?

[Z-z-z]

Hello, I have a question. I'm playing by summoner, and my eidolon has six arms, each of them are holding a weapon. With Multiweapon fighting I have redused penalities to -2 in all attacks I made. And in this feat stated this "Special: This feat replaces the Two-Weapon Fighting feat for creatures with more than two arms." So, i asked my DM, and he let me treat Multiweapon Fighting as Two-Weapon Fighting. Now I gonna take Imroved Two-Weapon Fighting, and this is where trouble is: in multiweapon fighting feat stated that "(It has one primary hand, and all the others are off hands.)", and the Improved Two-Weapon Fighting says that "In addition to the standard single extra attack you get with an off-hand weapon, you get a second attack with it, albeit at a –5 penalty". Does it mean that my eidolon will have 12 attacks in one round by full attack?

[Kalindlara]

Technically, no - there is no improving Multiweapon Fighting. What you're asking for is purely in the realm of houserules, and is best addressed to your GM.

I know that doesn't help much... sorry. ^_^

[Z-z-z]

So, decision that we can treat Multiweapon Fighting as Two-weapon Fighting for the feat prerequisites is completely on me and my DM, rigth?

[Imperius Rex]

James Jacob has said that Multiweapon Fighting should be improved by ITWF. Also Multiweapon Fighting does say it replaces Two-Weapon Fighting just not what for.

[Z-z-z]

Have found this http://rpg.stackexchange.com/questions/36043/how-does-the-multi-weapon-figh ting-feat-replace-the-two-weapon-fighting-feat