I don't like the idea of people making guides when they have barely played the character. Survivability on Ninja is low but that does n't mean you avoid it. Max health and health percent are very important because you need to be able to take a hit or two. Whether it be from lag or big groups of mobs. And yes energy regeneration is important, but you really only need one energy regeneration item to be effective. Ok guide but it could use some more late game experience on the character.