Best Boon for F!Grima

thats some mad luck man. +spd is really good. id go with that and merge the other 2 into the +spd.

Yeah SPD is definitely the best on F!Grima. Ensures she can double more and get double less often. Especially since she can't equip any breaths.

That's a tough call... I think it depends on your play style.

+Spd seems like the obvious choice, being a nifty 38 and all. And if you're a player phase person, that's probably the way to go.

However, both +Def and +Res have a lot of potential combined with Dragonskin. Remember that +Res is a superboon, too, meaning her BST will be one point higher.

+Res F!Grima would have a defensive spread of 34/33 on enemy phase.

+Def F!Grima's spread would be 37/29, making her more of a physical tank. Additionally, the extra defense gives more power to Bonfire.

Just some things to think about. Sorry I don't have a direct answer for you, but I hope this helps anyhow! :)

Do remember BST is only relevant if the super boon or super bane in question affects the BST ending at 0 or 5 for the bane and 4 or 9 for the boon.

As for F!Grima's boon, it really depends on the kind of play style you want to do with her. +Spd for player phase and either +Def or +Res for enemy phase. Of the two enemy phase boons, it depends on whether you need more of a physical wall or a decent physical/magical wall. Here's my suggested builds for each boon.

+Spd
Special: Aether (Arena) or Dragon Fang
A: Death Blow or Swift Sparrow
B: Desperation
Seal: Heavy Blade
She needs hone fliers/dragons or at least goad fliers to increase her doubling potential and to ensure heavy blade's activation. This is her only method of decreasing her cooldown because as a flier, she cannot use breath skills or wrath.

+Def or +Res
Special: Bonfire or Ignis
A: Dragon Skin
B: Quick Riposte / Vantage or Renewal if running QR seal.
Seal: Distant Def or Quick Riposte
Since she has higher Def than Res, she doesn't need the extra defenses vs melee but she'll want more vs. ranged, especially magic so Dist Def is a good option. She benefits more too with Fortify Dragons or Fortify Fliers. However you'll want to make sure she can double so QR is needed, either as a B-skill or seal, depending on builds and availability of your other skills.