74 ^^^ named fire elemental with adds, has incurable elemental debuff. You can't pass through the wall of fire until K'huthas, the water elemental lord, is killed as well.
74 ^^^ water elemental. Has a debuff that blurs vision. Killing this mob as well as the fire elemental K'hazid will lower the fire barrier near K'hazid, allowing you to progress on to the final boss.