Did someone tried this boss seriously (especially in HC) and could tell us more about the buffs (red, green, blue)?
Here's a recap of what they do :
Red: increasing healing done by 100%
Green: causes all healing done to be duplicated and distributed evenly amongst all friendly targets within 50 yards
Blue: reducing the mana cost of all spells by 75% and increasing spell haste by 100%
Note that they appear in that order, and that blue comes kind of late in the fight.
How do they interract with absorb/mastery?
Which spec/class would they favor?
Is the only change in HC difficulty that 2 people has to stay in twilight?
Do you two-heal it in HC as you should do in normal?