Equip one of your most powerful weapons (e.g., shotgun, bolt action rifle) and items that give you increased Weapon Damage and/or Rate of Fire. You may also want Fire Resistance, but doing the most damage quickly is paramount.

These screenshots show the single-player game, but in co-op mode the battle essentially works the same way.

Step onto the giant ball of dung. (Whee! I'll bet when you started playing you never imagined you'd fight a boss on a huge ball of poop!)

The god Khepri, in the form of a ginormous scarab wearing golden armor, scrabbles up onto the ball in front of you.

In order to damage Khepri, you must first expose his weak spot. Plant a remote bomb near either of his claws. Then detonate it to release his grip on the ball.

He will then rear up, exposing a glowing disk on his abdomen. Shoot it with your most powerful weapon...

...and you should see his health bar decrease slightly. As you do this, try to avoid the round, glowing fissures in the surface of the dung ball. These cause heat damage and stepping in any of them prevents you from beating the Challenge: Dodge All of the Lava Fissures on Khepri's Ball.

When Khepri hunches over and grabs the ball again, use another remote bomb on his claw to make him let go.

Then continue shooting the vulnerable spot on his belly. Repeat this process until you've taken a third of his health.

NOTE: If you make a mistake or if you step in one of the lava fissures, you can reload the last checkpoint from the main menu.

Once you've knocked off a third of his health, Khepri retreats to the background temporarily and the dung ball begins to roll. Keep moving in order stay on top of it and avoid the fissures. Several skeleton archers shoot little homing fireballs at you. Avoid them if possible so you can keep your power meter up, but don't fret if a few of them hit you. These are not the "meteors" in the challenge. We'll get to those in a bit. You can try and shoot the skeletons but, again, points don't matter for this level.

[Part 2 | Return to the Tomb of Khepri Walkthrough]