Watch the fight!
Strategy:
Elder Ekron is a simple tank and spank, who spawns a few adds throughout the fight.
Make sure your raid is feet on the floor but VERY CLOSE to the stairs on pull. Anyone still on the stairs may be ported across his room, and that port has a long loading screen. But step too far off before the rest of the raid, and you will pull him.
On pull you want your main tank to pull Ekron to the wall by the ramp you came down (healers will want to check line of site for their tanks as there can be some issues with the ramp), while your off tank prepares to grab his adds. Has a few detriments like any mob, but nothing of note.
The adds must be turned as they have a frontal other than that they are not bad. They come about every 10% starting at 70%. They can be burned or held, depending on your raids capabilities. They will stack up and you will get 3 or 4 of them which can start to hurt, so make sure if you are holding them you have the dps to burn Ekron quickly. These adds can ALSO be null caressed. (Tested on Varsoon, 2023) . If you hold them instead of burning, the heroic wurms mentioned next won't come.
Pulling close to the wall helps avoid some of the damage and knock around from falling rocks.
There is also a group of wurms that are to the North of the ramp. You will want to choose an expendable ranged character, to hail the ravenous wurm after they activate to stop them from spawning. They will still spawn at the end of the fight, but can be null caressed by a warlock and are easy to burn without the commotion of Ekron and his main adds. They are heroic.
Vah Shir Detect Weakness scan of Elder Ekron, courtesy of <Riders of the Storm>.
Varsoon TLE, 2023