The material below is Open Game Content from a 3PP Source
You can combine your mid-legs into one attack.
Prerequisites: Entobian, Two-weapon fighting.
Benefit: Combine your two mid-leg natural attacks into one natural attack, effectively increasing the number of dice of your mid-leg natural attack to 2. For example, a larvite attacking with Twinspike would do a base 2d4 points of damage instead of 1d4.