Evolved from a #BlackSlime that is mistreated and abandoned, they are born of feelings of frustration, betrayal and animate elastic biology. The Rubcok is very aroused and aggressive. The number of horns on its body is an indicator of how aggressive and aroused they are. They have multiple eyes that can see in almost complete darkness. Hiding from a Rubcok using camoflauge often does not work because of their sharp eyesight - ambushing them is difficult because of the near 360 range of vision their eyes provide them. They are also desensitized to touch, making them even more dangerous in a fight because they don't realize how much damage they have taken until their body fails them. This makes stunning them or knocking them out difficult. They see the world as their hostile, unfair playground - and they seek the ones who wronged them with a vengeance, hell bent on tormenting them with sexual humiliation. Every time they enact vengeance, the horns on their body smoothen out, until eventually all the anger and arousal is out of their system and they devolve back into a #BlackSlime with no memory of what they did. Their cum is particularly unpleasant to swallow, as it tastes especially sour. Despite this, some people have an acquired taste for it. In the #KinkRealm, enjoying the taste of Rubcok cum is seen as a sign that no-one should mess with that person. It is a waste of time and energy to try to tame these and calm them down with love and understanding, as the only thing that will satiate their angry arousal is taking it out on others and getting a reaction out of them. Every time they are defeated in a fight and dominated, their horns will grow sharper and their arousal and muscles will grow. This makes them particularly dangerous in hostile environments since they eventually tend to further evolve into worse monsters.