Micaiah special

I pulled a +res -hp Micaiah today, and just now built her. I ran some builds through a calculator and glimmer had better results. I gave mine glimmer, hope that helps!

What are IV's if she is +res then glacies is the one I recommend, if not then we can debate.

With Glimmer she will kill units that she can easily kill more easily but with Glacies she can kill units that normally she can't kill or at the very least deal some pretty big damage.

IMO if you are just gonna use her as a horse/armore killer then Glimmer but if you want her to realiably kill any unit then Glacies.

If you want her to kill Armor/Horse units, use Glimmer.
If you want her to kill any kind of unit, go for Iceberg. Glacies is a good option too, but since its a 4-turn special, she can be killed before triggering it, so be careful.

If shes using the BA-desp set then she doesnt need glimmer to get kills on armors/horses.

I've been using Micaiah since she was released and I gave her Glimmer. To clarify, people who answered so far are mostly correct, however, she doesn't need Glimmer for Armor/Horses as she oneshots those most of the time already (res-tanky green Armors might cause a problem, horses not so much cause they usually dont have much Res, she can beat a Cecilia just fine).

However, she will usually fall just a little short in Killing normal enemies when shes unbuffed, like regular Red units like Ayra, Mia, Karel etc since she wont double them, and Glimmer helps with that as she can more easily charge that - bait a horse mage, counter, mage is dead and Glimmer charged. Micaiah is pretty slow, which makes it hard to charge long specials.

This GREATLY depends on what IVs she is and what build you give her - If shes -spd and u give her Quick Riposte, you get easy charges for Glacies, you can give her Swordbreaker to deal with Ayras (but I wont recommend that its kind of a waste of her B slot) and if shes -atk, then ur far from killing them anyways, this also gets changed up if she is +spd or +res. -spd +res would be pretty ideal for Glacies tactics, otherwise, if she is not -atk I would opt for Glimmer.

I use Glacies on her because its overkill with her fat res

Unless your Micaiah is -Res I'd say go with Iceberg.

If you're using brash desperation I think moonbow might be good