Masstame 150's til you got 50 of them, use them together with a swarm of 25 eels backed up by mateboosted basils, mosas and tusos.
Absolutely insane, ofc have them covered by some tek and heavies set on players only.
Have them all following a passive tame on low distance (could be an angler), and have them set on attack-my-target, and aggro range high.
Have a trapped tame as scout on aggressive and aggro range high, when it aggro towards any dinos or players, it will send the whole force to kill and stun the target, when target is out of range or dead, they will come back to base.
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