Anyone done him with the minimum raid size?
We struggled pretty hard and it seems we need to perfect the strategy to kill him. Heard from friends that they simply facerolled the boss with 30 man groups but this is clearly not possible from my experience with 10 man.
We got him to 40% in the first heart phase but get overwhelmed in the 2nd phase, healer mana runs low and the sheer amount of adds gets overwhelming to deal with along with the debuffs.
I heard that bigger groups designate a group to deal with the tentacles that spawn far away in the corners, in a 10 man group with 5 or 6 dds obviously you can't dedicate so many people. We are melee heavy so running between tentacles is inefficient by itself already.
I would really appreciate sharing experiences how to solve this encounter efficiently in a small group.
Some things I noted is that
a) The amount of adds that spawn at 10 man is the same
b) going from 11 to 10 players reduced the hp of the nightmare horror by just 5%. At 12 players the Nightmare horror had I think 22.6mil hp, at 10 players it was 20.6mil.
c) The amount of corruptors is the same so when you are just 10 you have a lot higher % of your group constantly affected by debuffs
d) The amount of blobs is the same as with 30 man so this means a higher percentage of your group is constantly affected by fixate
I am sorry but I feel like Blizzard completely failed the balancing on this boss regarding raid sizes.