This quest starts in Tou Tou by the bar. Speak with Capt Warner
Now head to Ayan and to the Moarsmen Fort at 60.9S, 89.8W

Kill all blight moarsmen outside/inside temple to spawn portal. Cold works well on them.

Inside are harder versions named Blighted Grimy Moarsmen, watch out as they are hollow like the Moars on Viss Island.
This is also an excellent place to collect Moarsmuck

At fork go right.
Down long ramp.
Left down small ramp and stop.
Take right side.
At the multiple side rooms, head straight east then down the ramp.
Again past multiple side rooms and head north and down the ramp.

Be careful here as there are lot's of moarsmen in the side rooms.

Head east until you reach a wall. Now head to the right going south on radar and down the ramp. You'll come to some simple jumps here heading west. Again ignore the side rooms. All you need to do is tap space without holding shift to get across.

If you fall down into the pit below, head back through the small water rooms until you see steps that appear and disappear and go back up.

Continue to follow the platforms around, again ignoring all side rooms until you see a room with torches, moarsmen eggs, and moarsmen west on your radar.

This room is full of moarsmen, so be very careful here and proceed with caution.
Head over to the opposite side of this room by the alter and moarsmen eggs and you'll fine Siabot the Deranged a level 155 human, and two moarsmen next to him.

Defeat him and pickup two items.
The Tattered Grimy Moarsmen Ritual piece of paper and the Creation of Blighted Moarsmen book. (6day timer)

Return the paper to Capt Warner in Tou Tou for your reward
You've earned 56,184,660 experience. (Up to 30% of level 130)
and title of Champion of the Sea.