The final boss in VoA. This boss is done with a similar method as the one I used when I first killed Koralon. The main tactic here is to avoid letting the Frostbite stacks hit too high, especially near the end as the player becomes increasingly more vulnerable to frost damage due to the increased Whiteout stacks.
With that said I start the fight in a usual manner, and when the Frostbite stacks reaches up to 5 or 6, I use Mindbender to divert the boss's attention. I then proceed to run away with the help of Angelic Feathers. This will help drop the stacks. However once the stacks are dropped, keep kiting to stall for more time, until Mindbender's CD has less than 20 seconds remaining, before continuing to engage the boss. Immediately start kiting again once Mindbender becomes available. Simply rinse and repeat till the boss dies.