Sting (Ex)
Source: Advanced Player's Guide, p. 61
An eidolon possesses a long, barbed stinger at the end of its tail, granting it a sting attack. This attack is a primary attack. The sting deals 1d4 points of damage (1d6 if Large, 1d8 if Huge). The eidolon must possess the tail evolution to take this evolution. This evolution can be selected more than once, but the eidolon must possess an equal number of the tail evolution.