Being level 17 is enough to survive Zephyros' charge-up attack indefinitely(with enough potions), but he heals for 500 when he's near death.
Is it possible to kill him at the Black Citadel?
3 Answers
Yes, but you have to lose to do so. I won't give any spoilers. Die on purpose and you'll win at the Black Citadel.
In your first battle with him, you need to use your special power that you acquire after a certain event happens during that battle (It's a potential spoiler, but it's pretty obvious when it happens). Using that special power should end the battle, if I remember correctly.
I would assume that it is possible, there is an achievement called "Hero" which requires the player to defeat Zephyros. They would not release a game on steam where the achievements are impossible to get.
1
