climb up the ramps (top left of room) and go up until u see the lift, use it, and evry now
and again a hole in his head will open shoot into it and he will lose some of his health,
beware, at the top of the room you will be attacked by a large number of re-appearing
bugs.

Switch to a pistol as soon as you get into the room (so you can run faster) and put on
electrical armor when you are at the base and run up the ramps.

There will be several bomb bugs - don't bother shooting them - just dodge them and jump
over them if they block your way.

When you get halfway up, switch to flame armor and dodge the fireballs from the launcher
on his midsection.

When you're at the top, switch to the best armor you've got. You may want to head for the
lift where there is a 50 HP boost, but don't spend too much time up there because he has
homing attacks that have to be jumped over, and it's not the best place to hit him.

So on the second highest floor, that's where I do the most attacking.

Here's where I switch out from the pistol to the following loadout:

honeypot
Napalm Launcher
Grenade Launcher
RPG
Judgement.

First, I throw a honeypot grenade to keep the bomb bugs away. Then I instantly switch to
the next weapon without waiting for the honeypot grenade to hit the ground.

I fire my first grenades/rockets to destroy his left shoulder as I have difficulty dodging
attacks from that arm, which causes a lot of damage - aim for the red spots - you don't
have to be perfect.

I don't wait for the guns to reload between shots - I switch to the next weapon instantly
after firing.

Then I take out the right shoulder.

My aim is not to do damage - the purpose of this is to prevent him from hitting me with
his most powerful weapons.

After firing four of my weapons, I toss a honeypot grenade and continuing through the
cycle.

I can take out his eyes, too, which totally disables him for a few seconds, but often I
just jump over the laser attacks.

There's a hole in the top of his head that occasionally opens up. If I've got a moment I
donate explosives into it.

If it's closed, then I aim for whatever glowing red parts of him that I can, or I toss
another honeypot to keep the bomb bugs away.

Good luck.

basically i use rpg to take out his hands 1st ocassionally switch to pistol and run, then
dodge bugs and attacks fro him, up to the atairs up the elevator, use honeypot to keep
bugs away and fire rpgs at his opening head