Story related, can’t be missed.
*** Spoiler - click to reveal ***This is during the boat ride that the Spartan soldiers have prepared for Kratos. This will be one hell of a battle against you for you'll have to fight wave after waves of enemies. The reason this will be one hell of a fight is because you'll have to stay alive to the best of your abilities due to the fact that there's no health orb chest. You do have a blue orb chest which you should make use of wisely. Eventually, about half way into the battle lighting strikes will start to rain down all over the boat. If you're having a difficult time killing the enemies, then I suggest that you spam the grabbing move by pressing the Circle Button button against every opponent.
All credit goes to orginal authors at playstationtrophies.org, and this is merely updating truetrophy fans with these guides.
http://www.playstationtrophies.org/game/god-of-war-ghost-of-...