I wish first 6* arts defender was Astesia alt instead...
Talent 1:
For every 15 seconds Astesia stays on the battlefield, Res +5, stacking up to 4 times
Talent 2:
Every 8 second gets a spell reflection shield (max 2) that negates next arts attack and deals % of Astesia's ATK as arts damage, stealing 10 RES from enemy hit.

Skill 1 Defensive Recovery, Auto, 3 sp
Next attack deals damage to all blocked enemies and restores spell reflection shield
Skill 2 Auto Recovery, Manual, 25 sp, 15 seconds
Atk+, Def+, Aspd+, attack range increases, every attack bursts spell reflection shield. Spell reflection shield damage becomes AOE. Restores spell reflection shield on kill.
Skill 3 Auto Recovery, Manual, 50 sp, 40 seconds
Atk+, Def+, Stops attacking. All allies in range (Saria S2) gets benefits of Astesia's 2nd talent. For every spell reflection shield bursted during skill duration, Astesia gets 15 atk and 15 defence until next skill activation.