Okay my picks would be a sampire or a wammy. They both use bushido and necromancy. The sampire uses Vampiric Embrace and the wammy uses Wraith Form. The wammy is the easier to piece together but the sampire can be devastating. The down side they are useless in PvP. So monsters scream like little girls and die. But you go up against a pker and you can't leech enough to stay alive....the solution....run.
To find out more I recommend going to the warrior forum and using the search function there. They are both awesome builds you'll like it.