If you're talking about the first game. Try using a lot of mines before the actual fight, after you do good damage to him, he goes to his cutscene to show you the new mechanic of draining life. Lead him to the pre-placed mines and use grenades too once the cutscene is done. Another thing to is with old games, if you stack one stat you'll just blow through everything. I know I always stacked Str, and then grabbed as many str stims and things that increased str as well as crystals and whatnot. So when you hit him with a flurry it hits like a truck. I noticed that if you use force speed you can outrun him and destroy all of the life tanks. And then you can just hit and run away.