If you are here it means that the ocean in minecraft is too boring and calm for you. 
You want  adventure every time you leave your base with your boat. You've come 
to the right place, because thanks to this mod you will be scared to put even one
finger on the surface of water.

Eidolon wyrm is a mod whose main purpose is to make the oceans unsafe to traverse. 
For this purpose, a new mob has been added to the game - The Eidolon Wyrm.

It is a sea monster that moves faster than the player and squeezes into one-block gaps.

When it catches you, it grabs you with its jaws and tears you to into blocky pieces.

When it encounters a traveler on a boat, he will sink it first, and then the player, preventing 
him from escaping his imminent death. Although this beast is dangerous and murderous, it 
is not a brainless killing machine. If the player gives it a cake, it will become friendly and 
even support player in fights. However, remember that this is not a pet and will not follow you.
Even though it won't despawn, it's recommended to drag it with a lead and lock it in the enclosure.

Lastly, these beasts are afraid of glow squids, so it's a good idea to take one for longer ocean voyages