This creature is called the SlagVermin (w/m: lava snake)
The average SlagVermin is 10 feet and can walk on two or four claws. They have the body of a snake and four short arms. It also can sliver which is the quickest way it travels. It is resistant to heat and can swim and breathe in any substance (e.g: lava/magma, water).
Male Slag are usually slower than female but stronger. They have blue tongues and 7 eyes. Males are also mostly brown or red in color with red or green eyes, and females are mostly green and rarely yellow or even purple. On each of their paws they have two fingers wich they use to crawl around with. The blue stripe most Slag have (some Slag don’t have any stripes) is poisonous and they use their tail to swing quickly and flings poison substance at their targets. At the point of contact with the poison, you’d have about 3 hours until you pass away, that is if you escape it’s jaws after you get poisoned. They have 3 big spikes and 5 little spikes on their neck (young females have 7 little spikes that they molt off as they grow). The little yellow neck flap under their jaw holds mild poison which transfers into their victim after being bit with its long, sword like teeth.
They usually live in wide fields or rocky grounds where they can burrow underground and connect with liquid substances.