Below rockwell’s heart is an acid pool, wait for the acid pool to disperse and you will find mutagel. Use a mining drill to collect all the mutagel l, you can use other means of collecting the mutagel I just found mining drill collects a lot of it. Be careful as this place is quite dangerous! Bring a friend or a trusted Dino. Hope this helps survivors!
Bait out its zap attack and once it’s doing net gun it, blast it with a Fabricated sniper or tek rifle until it is at the right health once it gets free from the net have a friend bait out the zap attack and mount it as fast as possible have your mutegen ready you need to be really fast with it, basically like an equus but deadlier!