Multiweapon feat & multiple arms

[Oryan77]

The Multiweapon feat in the MM says a creature takes only a -2 on primary hands & -6 with off hands. It then says the first hand is primary & all other hands are off hands.

But a Marilith has 6 arms, yet the primary arms highest attack is +25 & the other 5 arms are also +25. I don't see a penalty figured in here.

I'm just trying to understand how fighting with multiple arms & weapons works using the multiweapon feat. I don't know what I'm overlooking.

 

[Michael Silverbane]

The multiweapon fighting feat says...

Benefit: Penalties for fighting with multiple weapons are reduced by 2 with the primary hand and reduced by 6 with off hands.
Normal: A creature without this feat takes a –6 penalty on attacks made with its primary hand and a –10 penalty on attacks made with its off hands. (It has one primary hand, and all the others are off hands.) See Two-Weapon Fighting.
Special: This feat replaces the Two-Weapon Fighting feat for creatures with more than two arms.

Emphasis added

Multiweapon fighting works exactly like two weapon fighting, but with more off-hands. So a multiweapon fighter without the feats, and using inappropriate weapons would be taking a penalty of -6 on its main attack and -10 on all others, a multiweapon fighter with multiweapon fighting and using inappropriate weapons will be taking a penalty of -4 on all of its attacks, and a multiweapon fighter with the multiweapon fighting feat and using light weapons in all of its off-hands will be taking a penalty of -2 to all of its attacks...

Later
silver

 

[Darklone]

But a Marilith has 6 arms, yet the primary arms highest attack is +25 & the other 5 arms are also +25. I don't see a penalty figured in here.

Silverbane is right... the penalty of -2 to all attacks is included. The primary arm can still wield a bigger weapon and gets the full str bonus though.