Apparently Koralon does not have a hard enrage timer, although he still has the soft enrage. Therefore, armed the 10man strategy, I decided crank it up to 25man.
The 25 man version is exactly the same as the 10man version. And the strategy used in the 10 version can be applied in the 25man. However due to the soft enrage, and the amount of time the fight takes, the boss will hit extremely hard in the later stages. So be sure to kite as much as possible.
The boss starts off quite simple, but he gains a stack of Burning Fury every 20 seconds, increasing his damage by 5%. Due to the change to mana regen mechanics, it is no longer viable to spam Flash Heal through Molten Fists, so it is completely avoided by kiting. When the boss is closing in, Mindbender helps to set him back a bit, but the fact that it gets 1 or 2 shotted by the boss means that it will provide pretty much 0 mana return. So the trick is to summon the Mindbender, but dont drop threat, wait until it has 2 or 3 seconds remaining on its duration, and only then let the boss 1 shot it.