Ruin crawler

         The ruin crawler would have 4 short, stubby legs and a long tail and it's body would be a rectangle. It's face would have deep scary eyes and 2 fangs with a mouth. This creature would spawn in/around mineshafts and strongholds. When it is close to light it will put it out (it will come back when the ruin crawler goes away). If it sees a player it will give the player blindness and then it will charge at the player doing damage. This mob would probably drop some sort of fang if you managed to kill it. This mob would be semi-rare. I feel like this mob would draw a lot more attention to the underground ruins. It would give a sense of awareness around the underground ruins.