Additional Limbs [Inherited]
Prerequisite: Aasimar or Tiefling only, may only be taken at character creation

Benefit: The planetouched character has inherited an extra set of arms due to her extra-planar ancestory.  These arms are usually located directly beneath the character's origin set, but not always.  These limbs however are not as proficient as the origin set and suffer a -4 circumstance penalty to all attack rolls, damage rolls, skill checks and ability checks.  Although these penalties may be reduced later by taking Limb Specialization and Limb Mastery.  Reguardless, the limbs act in accordance to the character's whims as would a normal set of arms. 

The additional limbs may also be used to aid the character in most skill checks where an extra set of arms would be useful.  In such cases the penalties are ignored and the character gains a +2 synergy bonus to those specific tasks as long as all four limbs are being used.
Limb Specialization [General]
Prerequisite: Additional Limbs, Dex 14+, base attack bonus +4

Benefit: The planetouched character no longer suffers from the -4 circumstance penalty afforded by the Additional Limbs feat.  Instead the penalties are reduced to -2 with each arm. 
Limb Mastery [General]
Prerequisite: Additional Limbs, Limb Master, Dex 16+, base attack bonus +8

Benefit: As per Limb Specialization except all circumstance penalties afforded by the feat Additional Limbs are reduced to 0.