Hello, i am working on a plugin which spawns a slime of size 3, adds invulnarability and sets the velocity to 2, so it bounces. but i'm struggling with spawning the thing. i can spawn the entity but i have absoluteliy no idea how to apply the size, the invulnarability and the velocity. the velocity works on players, but i have no idea how to apply it to mobs. can someone please help me? thanks in advance.