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.
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.