To incorporate sailing. To make sailing home a more strenuous yet epic feeling. Like, you have a full hold of iron and blackmetal and you're far from home so you set sail, yet a storm sets in and you take a little bit of damage from the waves. Them you hear a roar and see a sea serpent barreling towards you but thankfully you happen to have the wind on your side.

But you got to close to the shores of the plains and a deathsquito sinks your boat while trying to kill you.

Bet you thought this story was gonna end well, didn't you?