Shirren

Blindsense
Shirrens' sensitive antennae grant them blindsense (vibration)—the ability to sense vibrations in the air—out to 30 feet. A shirren ignores the Stealth bonuses from any form of visual camouflage, invisibility, and the like when attempting a Perception check opposed by a creature’s Stealth check. Even on a successful Perception check, any foe that can’t be seen still has total concealment (50% miss chance) against a shirren, and the shirren still has the normal miss chance when attacking foes that have concealment. A shirren is still flatfooted against attacks from creatures it can’t see.

Communalism
Shirrens are used to working with others as part of a team. Once per day, as long as an ally is within 10 feet, a shirren can roll a single attack roll or skill check twice and take the higher result.

Limited Telepathy
Shirrens are incapable of physical speech. The only noise they can make is through the clicking of their mandibles. Shirrens instead can communicate telepathically with any creatures within 30 feet with whom they share a language. Conversing telepathically with multiple creatures simultaneously is just as difficult as listening to multiple people speak.

Many Legs
Shirren have a grand total of eight limbs. The two fore limbs are used as arms, and can grasp objects as well as a human hand, while the four hind limbs are used as legs. The remaining two limbs can be used as either arms and legs at the Shirren's discretion. This allows them to wield and hold up to four hands' worth of weapons and equipment at once, but it doesn't increase the number of attacks they can make during combat. If both of their secondary arms are empty, they can use them as legs to stabilize themselves, giving a +4 bonus to defending against Bull Rushes, Repositions, and Trips.

Castes
Shirrens are born into one of multiple castes, based off their genes or the needs of the nest. The castes include:


 * Drone Caste
 * Ability Score: +2 Dexterity
 * Size: Small
 * Flight: A drone shirren gains an extraordinary flight speed of 30 feet with average maneuverability. Until the Shirren is 5th level, he or she must end their movement on the ground at the end of each turn, or fall.
 * Agile: Drone shirrens gain Skill Focus in Acrobatics or Stealth as a bonus feat.
 * Soldier Caste
 * Ability Score: +2 Strength
 * Size: Medium
 * Natural Weapon: Soldier shirrens have a bite (1d6 P with Penetrating) natural weapon.
 * Survivable: Soldier shirrens have a +4 bonus on Fortitude saves against fatigue and exhaustion, as well as Constitution checks caused by starvation or thirst.
 * Worker Caste
 * Ability Score: +2 Intelligence
 * Size: Small or Medium
 * Heavyweight: Worker shirrens are considered one size category larger for the purposes of deciding how much they can life and carry.
 * Technical: Worker shirrens gain Skill Focus: Engineering or Profession as a bonus feat.