The Shadow Prison debuff will stack 500 extra damage for each second you are on the move. Does
Standing still for 10 seconds will reset the debuff.
Do the fight as you would normally would, just don’t move around without reason.
In general melees should still run behind the Ball of Flames to soak damage, (exceptions when Shadow Prison debuff did not fall off).
Glittering Sparks (cone aoe by fire prince) slows targets by 40% and now seems to target a random raid member instead of just the tank.
White orbs fall faster, most ranged should dps them when needed, having assigned ranged would mean too much movement.