we just downed this on 25 man. first of all, it ain't hard; it's only confusing!
we had 6 healers and 2 tanks. and at first we tried doing with 2 platform groups, but found out that even with most efficient strategy, we were missing out on 2 platforms; and they ended up in 8 adds spamming us when boss is at 20% --> wipe
so we decided to go with 3 groups, all with 4 dps and 1 healer. for the sake of easier understanding, i'll call groups A B and C, and platforms 1 to 9... after 9, the cycle resets; so DBM's 10th platform warning, is actually the same with the beginning of the fight.
important thing to know; till 5th platform, there's only 1 platform at a time, and they'r all BELOW. at 5th, things get ugly, and theres 2 platforms at a time. so to sum up, 5 and 6 form at the same time, one up, one below. after that 7th is at up middle. than 8th and 9th at up again; and then resets the cycle; first 4 below etc etc. you should down the boss at maximum halfway of 3rd cycle.
Group A gets: 1st (down), 2nd (down), 6th (up), 8th or 9th (just get another one while ur up there, one except the middle... middle is group B's job)
Group B gets: 3rd (down), 4th (down), 7th (the one on middle, up)
Group C gets: 5th (down), and all the rest remaining up (there should be 2 platforms not covered by groups A and B; we seriously couldn't understand in all that haze how/when did 8th and 9th spawn.. so group c basically goes down for 5th, gets their feathers; and covers all upper platforms the prevo groups aren't getting.)
put 4 colors on 4 edges of the platform; you'll see that the groups get to mostly use the same edge, so it'll be better to adjust yourself to it. i, in group A, came according to always the same edge to start going on small platforms, so it was easy to notice where i'd go.
--run to the boss before the pushback; videos and guides say it's like Lei Shi; it's nothing like fcking lei shi; with druid sprints i could barely stand where i was.. if ur even halfway on platform; you will fall; you won't die, but lose considerable time.
--there's no fall damage in the room. so when going from boss to lower platform, WALK and fall... when going down from upper platform to boss JUMP and fall. the difference is really important, will save you a lot of dps.
--we didn't get into the "orb catching" or "blob interfering in the air" stuff; it was too much hectic for that tbh.
--spreading before that aoe spell is extremely important. other than that, there aint much damage on raid or even the tanks (except Quill)
--Quill's timer on DBM's broken, get prepared (stack up and heal) minimum 8 seconds before it says is to be casted.
...once you get the groups' rotation going; most of your wipes will be 5-10%ish... we used bloodlust on 20%.
-down the boss, and welcome to the new trash which is even harder