Performing Azura +Hp -Res

Okay so big news. I actually have a solid dancer unit now. The one practically everyone has and is really good: Performing Azuuuraa. Yes, I did the Three heroes quests and proudly decided to risk it. However.. She is a +Hp -Res.. Its not horrible? But it could be better. Anywho. Im not entirely sure how to build her i preferably want to use her for like all of the infernal challenges.. But even my current units don't stand a chance at their best IVs. So if there is a good infernal build for her. Do comment it, but otherwise, help me come up with an Arena build. And lastly, dont be afraid to tell me some heavy investments.. Besides Aether im willing to go as far as i can with this Azura