1) portals
portals need to be killed by particular weapons (blunt, slash, h2h, pierce) and by different nuke/dots (fire, cold, magic, disease... etc). They spawn adds and after the 2nd add it spawns a named that hits hard, so dps is essential. The genie adds are mezzable, and i think the others aren't. The goal is to kill portals before their named pops. There are 5 portals and i believe their spawn times are timed.
The adds in this part drop some "mod rod" type wands that let you recover some mana and endurance. This is important for something i will explain on the bottom.
2) drakes
2 drakes spawn after you finish portals (not adds but not sure). Their names are Char and Blaze. One of them will start hitting very hard in comparison with the other. Their damage will go down as they go down in health, so you should focus on the hard hitting one first. Take them equally down after 50% (not entirely sure why we do this) and then kill them.
3) Suchun
Suchun will become targettable after youve killed the 2 drakes. He hits hard, 6k is about right on a full AC tank. 5k or so on defensive. During him being alive a DT (like vishi's) will land on all your raid. It has to be cured with RC6 or RGC or you get DT'd. Also the portals will start to pop, their adds will start to pop and both Drakes will pop. Kill him, then kill his adds and you win. You won't win if you dont kill everything.
During the entire event:
Mana/Endurance drain - Suchun although untargettable does a continuous mana/end drain. This is very important to avoid (indoors - so hide LoS from him).
Mana/Endurance below 50%
Once you have your mana and endurance below 50%, you will be continuously banished to the lava surrounding the fight.
Mana/Endurance below 20%
When you have mana below 20% you will be death touched with only a super fast warning that will probably give you enough time to click your mana/end wand if you're fast. But most of the time, say goodbye.
is all i know