When the boss (Lucifer) activates the blue bracelets it means she will use a full area attack, you need to attack the bracelets before the next attack.
Otherwise everyone will die.
IT IS SERIOUS.
#Lucifer - Frozen hate
delicate escarp
hollow hill
To add some context here a screen from the Compendium, added red circles to clarify what need to be attacked.
An important detail: you can destroy only one of the two shackle and the side of the destroyed shackle will have a safe spot.
