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Kologarn himself has two notable abilities that require specific tactics to handle. The first is
Overhead Smash which he will use on the tank. This ability inflicts a debuff that decreases the armor of the tank by 20%, and it can stack. Very geared tanks with good healing can survive a single stack of this
debuff, but they shouldn't stay tanking him if they get two. Tank swapping is necessary to stay alive, and three tanks rotating out is recommended. Kologarn's other ability is called
Focused Eye Beem, and effects the rest of the raid. FEB will randomly target a raid member and chase them. A beam shoots from each of Kologarn's eyes, slowly focusing in on the target. It is easy to see if he is targeting you if you're paying attention. A good strategy for handling eye beams is to have a designated "kiting" area. In one of my raids we used the back wall, and the rest of the raid stayed clear of that area. A person targeted by FEB would run to the back and strafe across the wall until it was over. If the person chosen by FEB dies, or uses any ability to break the targeting (vanish, shadowmeld, etc) then it will switch to somebody else. FEB also deals some damage to anyone near the person targeted, so for the duration of the fight players need to be spread out.