This is my current build, she's a specialised mage killer. As you can see I've been using Glacies and have been doing perfectly. But I just got Pity broken by Ike, and since I don't want him I decided to fodder. Since pretty much no one efficiently runs heavy blade on the A slot then the next option is Aether. Since I love Felicia and I'm working on +10ing so figured it was a nice idea to give her Aether. But I'm not too sure... so that's why I ask... Is it a good idea?
If you're working on a +10 then I would definitely recommend inheriting Aether, even if for nothing more than just extra Arena points.
From a more practical perspective however, I have every single inheritable Special for my Felicia and I can say from experience that, even though Aether is a perfectly fine Special for Felicia in certain situations, you will rarely ever find yourself running anything on her that's not Iceberg/Glacies.
Glacies:
- 1 less cooldown;
- deals 31 dmg. Aether will deal 30 damage, if weaker defensive stat is more than 60.
Aether:
- better arena scoring;
- sustain;
Heal from Aether it is not enought to reliably heal her for tanking magic damage many times in one battle, and with desperation, she dont realy need that. Also with adaptive damage % def/res reduction is not that effective.
TL:DR Unless you want to up her scoring in arena, Glacies is superior option.
I have Felicia at +6. Nice IV you have there.
Anyways, there's basically one practical use of aether that I know about and one only. It's for when you feel comfortable enough deleting some mage without a special and want to save your special for someone else instead of the glacies firing when you don't need it and then not having it for someone you actually need it against. You're not getting much sustain out of the build on 35 HP if you're using fury.
Actually, the glacies overkill issue can be solved just by switching to a stat refine. Extra spd is good if you're not using QR because of stuff like the new Celica refine, or extra res if you want to get rid of fury and still ploy as well as she currently does. What normal charge rates do is give you three charges from busting a mage, and then glacies will activate on the desperation follow-up for far more damage than aether.
I also feel that aether gives us bad value for special charges because she's targeting the lower defensive stat anyways, so generally you're cutting through something which is usually somewhat thin anyways.
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