The Ol Raszle Daszle

At 65% the boss will push out of P1 and into the first intermission. To do this phase normally, you split the raid into two groups and wait for her to knock you back to the side platforms to kill adds. On each of these side platforms as you're waiting for the boss to knock you back there is a Concentrated Storm Essence. By the time the knockback has pushed you to land here it will have despawned, which means that while waiting for the knockback you must send a player from each team across to collect the essences before they do. These players will take gradually increasing ticking damage until the phase transition happens. Once they have the debuffs they suffer no ill effects and just need to survive until P3.

Once P3 starts and you're knocked back to the main platform, both these players must stack together in the Raging Storm (the creeping lightning at the edge of the room). Doing this will cause a Concentrated Storm add to spawn in the middle of the room. The add needs to be tanked but it's only real mechanic is causing orbs to fly outward from underneath him much like the add in the second intermission. It has little health and dies quickly. Once it's dead the boss can be killed and the achievement should go white when you do it.

If you have any questions about the achievements feel free to add me to Btag or Discord!

Btag - FrostyShot#1667
Discord - Yarini#9999

Just going to add that should the person with the debuff die, you can brez them and they won't lose the debuff. Still can summon the add at the very end.

You could probably just leave one of the persons dead and brez them just before the final phase, if you really wanted.

Not a particularly difficult achievement. You can send Demon Hunters, Evokers, and Hunters over to the platforms pretty easily, but DHs with Netherwalk are probably best. You take a *lot* of damage until you grab the essence, and after that it's a normal fight until P3. You have two options for P3 strat for this achievement:

1.) Spawn the add immediately and begin DPSing while you have more room.
2.) Delay the spawn until Bloodlust/Potions align (depending on Lust strat)

The add has just over 10 million HP in a 19 man group, and spawns under Raszageth. The only notable ability it does is the same lightning orb AoE as the Intermission 2 adds do.

https://www.youtube.com/watch?v=f8q92Gq19vU

This achievement really doesn't alter the fight, and I'd say it's one of the easiest ones.