Difficulty level: Nightmare (Nightmare Mode short: NM)
In the whole raid the affix (decay) rules.
Decay makes the boss rot internally which makes the boss deal more damage after every 25% HP, this affects AOE, Cleave, Frontal, Magical Damage and Physical Damage. When the boss reaches 25% HP, a random player is killed every 7 seconds. Hard Enrage
The Nightmare Mode is supposed to be an additional mode for ambitious raiders, where you can get out various runes, set pieces and other stuff. The idea behind it is that the bosses in Nightmare Mode adapt to the players. If the players have a lot of damage, the boss gets a secret mechanic to keep the players on their toes. Hidden Mechanic: (These attacks vary from boss to boss) Boss 1, for example, casts an AoE of 200 fireballs across the board from the boss area every 10 seconds. If the damage from the raid is only minmal-maximal sufficient, this mechanic is dropped. This special mechanic is triggered when you drain 35% of the boss's life within the first minute.