Quote Originally Posted by keeper2161 View Post
I read somewhere that multiweapon works with natural weapons. But I may have been mistaken.
As AmberVael and Necroticplague have pointed out, Multi-Weapon Fighting works whenever you have three or more hands and all those hands are wielding manufactured weapons. The penalties only apply to your primary and offhand weapons. In general, natural weapons can't be used with the TWF or MWF rules (although there are a couple exceptions).

Natural weapons have special rules: they can only attack once per round, and they are either primary or secondary attacks. This generally prevents the primary natural weapon from using TWF/MWF, because you don't get iteratives with it, and if a natural weapon isn't primary, then it becomes a secondary attack: -5 attack penalty, and only 1/2 Str bonus on damage. The TWF/MWF penalties and the secondary attack penalties are completely separate, and don't affect each other.

However, you can *combine* manufactured weapons and natural weapons. This is a little difficult with Girallon Arms because your claws would presumably be wielding weapons, and thus should not be available to make claw attacks. (Technically, there is no actual written rule that says a claw wielding a weapon can't also attack as a claw, but basic common sense generally says otherwise.) There are two weapons you can use that don't involve claws: unarmed strike and armor spikes. If you take Improved Unarmed Strike, you can use that as your primary iterative attack. Bracers of Striking (1310 GP, Magic of Faerun), Ring of Might (4000 GP, Magic of Faerun), or Fanged Ring (10000 GP, Dragon Magic) can be used to add IUS. Armor spikes cost 50 GP and are light martial weapons, so they work well as offhand weapons. Netcutter spikes (150 GP, Races of the Wild) are even better: +4 circumstance bonus to get out of any nets/webs/entangle effects. If you combine unarmed strike with armor spikes and four claw attacks, you'd get something like:

unarmed -2/armor spikes -2/claw#1 -5/claw#2 -5/claw#3 -5/claw#4 -5