Whiptail

This creature resembles nothing so much as a giant scorpion, easily capable of hunting prey as large as a man. Longer than a halfling is tall, its giant insectile body scuttles about on 8 swift legs, armed with two pincer claws over a foot long. It gazes at you with cold-gleaming faceted eyes, and arched over its back you see its segmented tail, tipped with a deadly sting, ready to reach out with poisonous agony.