-Omar has protective shields circling him, so your special attacks are not going to do any damage to him. Drop down to the area below and look at Omar to see what type of shield he has around himself. Omar switches between a fire shield and an ice shield. If you see a fire shield, climb up the ladder and follow the right path. Climb down the next ladder and go to the right, then take the ice sword and return to Omar. Shoot an ice bolt through the opening in Omar's shield to do damage. If you see an ice shield, climb up the ladder and follow the left path, then climb down the next ladder and go to the left. Take the fire sword and return to Omar. Shoot a fire bolt through the opening in Omar's shield to do damage. Keep doing this until Omar has been brought down. After that, climb up the ladder and ride the lift up to the top. Time your jumps over the lava and Omar's attacks, then jump over to him. Once you are next to Omar, attack him with your sword to do damage. Then, go over to the opposite side and repeat those tactics.
-When Omar has a fire shield around him, do not shoot with a fire sword or his health will go up. If he has an ice shield, do not use an ice weapon.