remove the reaper leviathan next to the island.

Elavion

If it's supposed to deter the player from visiting the island to early it doesn't do a very good job, seeing as 9 times out of 10 you won't even see him until you're leaving the island because he's busy swimming underground :P.

But seriously, it glitches through the island's shore waaaay to much and all it does besides that is annoying anyone who decided to put a base in that area.

Rezca

Seeing as how generally people approach the island from the opposite side, he really doesn't do a good job at all. If anything he's deterring people from approaching the wreck nearby, but even then it's usually pretty easy to just go right past him.