The skill third eye is a passive skill only abstained in irradiated areas. The third skill produces a eye randomly on the body it can be any where it does not block function of organs, it cannot be used to see its surroundings, it will fire a vein at super sonic speed at targets that threaten the user, it will decide on it's own what is a threat or not. The skill can be stacked. The third eye cannot be removed from the body, if cut off from the body it will randomly appear somewhere else on the body, the stacked third is called triocular, it just means there are multiple third eyes in the body.