So this boss turned out to be harder on LFR than flex and normal.
first of all instead of clicking orbs it sends players randomly to the test thingy.
Terrible dpsers were being sent to the realm multiple times while the top 3 dps (only dps to break 100k) from the first 2 bosses went the entire time without being sent to the test realm at all.
We wiped 4 times before I bailed, this fight has way too much RNG on LFR it's terrible.
I should also mention we hit berserk twice with the boss on sub 20%, something that would not have happened if one of the top 3 dps went to the test thingy and cleansed their corruption o they were able to do more than 50% of their total damn damage.