Incredibly fast mount. If it touches land it will die in less than 1 second. Very very low hp. Tame it naked. It ignores armor so save your mats. Build a trap, pin it down with as many pillars as you can. Place a stone hatch on top of him. Expect to die. A lot. Like, a whole, whole lot.
Mantas are very quick ocean transport mounts, which also double as a powerful PVP asset. The manta's attack ignore the armour stat, which makes a high melee damage manta incredibly powerful to players and small tames. It's quick speed also allows it to move very fast. It can jump out of the water, but on contact with land, it will begin dying very fast. Very good for travel on the center map, as it can jump over the many islands if it gets a good run up