What A Skill for Sharena?

Mine currently has Fury and I'm not sure if I should keep this skill. I am optimizing her for Arena. She also has the following skills:

+Eff Fensalir
Aether
Fury (keep?)
Renewal (Chill Def as an alternative)
Fortify Def (Will surely change this)

I have spare Spd/Def Bond fodder a.k.a. Ethlyn, and a spare Dorcas for Sturdy Stance.