When fighting them have a glow stick active they are a lot weaker you can kill a lot more faster if you don’t have a real high level tame then pop out your glow pet to despawn them heal up repeat good luck
When about three spawn, one will turn into a alpha, ( large and orange) which are the ones that drop the venom. WARNING: When they drop the venom, a bag will drop with the venom inside, it won’t go into your or your tames inventory!!! If ten spawn, a reaper will appear. Keep a light pet with you so they don’t overwhelm you. Light pets will burn them, doing major damage. That’s really all you need to know to fight them!