8 legged custom model with custom animations

Hello everyone,

In one of my friends server (i do not currently have contact with him) I saw a gigantic worm which has custom animations and behavior. I want to do a custom scorpion model which can sting, capture with claws and all of the custom animations.

He could be able to do custom model or object which could move, interract, attack, grap and etc. I want to do the same thing but I couldn’t be able to find how. Can someone help?