Spinosaurus is the coolest and one of the most powerful creatures on the arks. Quite easy to tame, but you have to watch out for its torpor, which runs down pretty fast. They have 2 modes, two legged, which allows them to deal more damage, but move slower, and there is four legged mode, which makes it move faster, but deals less damage. It also has water buffs, making it amazing. You need to tame this!