Cecilia

This is the quintessential anti-Brave Hector build. These skills are far from flashy, but Cecilia's niche of being cavalry while being able to double down on two (or three) strong A-slot skills give her some unique potential to act as a very low cost answer to the toughest Special Fighter-running, Far Save-using 🅱️ectors you can cook up. When you compare this prospect against building other units to fit this role such as Lewyn, Olwen, or Selena, you will unilaterally reach the conclusion that "Cecilia won't cost me an arm and a leg."

When you get right down to it, there really is nothing special about this "build." I'm not going to tell you to roll for fodder XYZ, but I sure as hell am gonna tell you to sack that Abel for Lancebreaker. I will contest that I can't budge on that.

As for skills excluding Lancebreaker, they aren't really important. All you need to be concerned about is stacking attack to capitalize on Triangle Adept's scalar modifier. There is one thing that Brave Hector hates more than green mages: those that are packing Triangle Adept. Consider player phase skills such as Fury, Death Blow, or Atk/Def Solo, to name a few. Even if you have to run Attack+3 in A and S, do it.

Use your C-slot to give support to your cavalry allies (Hone Cavalry), or just use Savage Blow to avoid getting gimped by Panic status.

Don't expect your Special to matter too much, considering your role is to kill Brave Hector.

Choose your assist skill as necessary to suit your Aether Raids Defense. If you are using Cecilia in Light Season, it should go without saying this build will also be very effective against Nótt, though depending on the defense archetype you are facing you may run into other incontrovertible issues. To put it one way, you won't see the likes of Brave Hector on Dark defenses very often until Far Save becomes available in the permanent pool.

Preferred IV: + Atk / - Spd

Weapon: Tome of Order (+Eff)

Assist: Reposition / Swap / Draw Back

Special: Glimmer / Moonbow / Luna

Passive A: Close Foil / Close Counter / Atk/Def Solo 3

Passive B: Lull Atk/Res 3 / Quick Riposte 3 / Guard 3

Passive C: Fortify Cavalry 3 / Hone Cavalry 3 / Rouse Def/Res 3

Sacred Seal: Atk/Def Bond 3 / Quick Riposte 3

I've turned Cecilia into a specialty fighter for Blue/Colorless foes only. Her new weapon upgrade makes her perfect for this role. Her speed is still terrible and she will be doubled by most characters so steer her clear of even green units.

Reposition is the optimal choice but Swap is also a good choice if you are going with the Close Foil build and you're using her to switch with someone that is in range of a blue or colorless foe.

Specials with 2 CD are great but Luna is also a solid choice since it'll be ready after her first encounter seeing as how they'll likely hit her twice.

Close Foil is best to handle colorless beasts and all lance units. It also helps when dealing with archers since her def is lower than her res. If you don't have Close Foil then Atk/Def Solo 3 works great when dealing with only ranged opponents in Blue/Colorless

Lull Atk/Res 3 just helps seal the deal in making sure she can handle everyone in the blue/colorless spectrum. If you have Quick Riposte 3 then that'll work too so that you ensure you kill your blue/colorless opponent. Guard 3 makes sure your opponents don't trigger any really good specials on you.

Cecilia works best in a Horse Emblem so that she greatly benefits from the +6 boost to every stat. Switch out Hone/Fortify depending on the team you have her on. If you'd rather run her solo then Rouse Def/Res 3 is great.

There are so many good options for seals so pick one that isn't already going to someone else. My build is best for baiting attackers so I went with a Bond seal.

Preferred IV: + Atk / - Spd

Weapon: Tome of Order (+Eff)

Assist: Reposition / Swap / Draw Back

Special: Glimmer / Moonbow / Luna

Passive A: Close Foil / Close Counter / Atk/Def Solo 3

Passive B: Lull Atk/Res 3 / Quick Riposte 3 / Guard 3

Passive C: Fortify Cavalry 3 / Hone Cavalry 3 / Rouse Def/Res 3

Sacred Seal: Atk/Def Bond 3 / Quick Riposte 3

I've turned Cecilia into a specialty fighter for Blue/Colorless foes only. Her new weapon upgrade makes her perfect for this role. Her speed is still terrible and she will be doubled by most characters so steer her clear of even green units.

Reposition is the optimal choice but Swap is also a good choice if you are going with the Close Foil build and you're using her to switch with someone that is in range of a blue or colorless foe.

Specials with 2 CD are great but Luna is also a solid choice since it'll be ready after her first encounter seeing as how they'll likely hit her twice.

Close Foil is best to handle colorless beasts and all lance units. It also helps when dealing with archers since her def is lower than her res. If you don't have Close Foil then Atk/Def Solo 3 works great when dealing with only ranged opponents in Blue/Colorless

Lull Atk/Res 3 just helps seal the deal in making sure she can handle everyone in the blue/colorless spectrum. If you have Quick Riposte 3 then that'll work too so that you ensure you kill your blue/colorless opponent. Guard 3 makes sure your opponents don't trigger any really good specials on you.

Cecilia works best in a Horse Emblem so that she greatly benefits from the +6 boost to every stat. Switch out Hone/Fortify depending on the team you have her on. If you'd rather run her solo then Rouse Def/Res 3 is great.

There are so many good options for seals so pick one that isn't already going to someone else. My build is best for baiting attackers so I went with a Bond seal.

Although Cecilia is not the powerhouse she once was, she is still among the select few green tome cavaliers in the game. Although she is not as strong as Gunnthra or Olwen, she is far more readily available and can be made passable without too much investment.
My Cecilia is built to counter things that she's already good at killing, thus Triangle Adept and Bowbreaker to augment her ability to take care of blue tomes and colorless/bows. Atk Smoke and Distant Defense are quite nice to improve her survivability as her bulk is low to begin with.
However, Atk Smoke is somewhat difficult to obtain, and so Savage Blow is a good alternative.
As with all cavalry units, she will function better with support from cavalry buffs, and is grateful for any other buffs she can come by.

(+10) (S-Supported)
The Commanding Officer of my army, the Mage General is a force to be reckoned with on cavalry teams. Near unrivalled power when fully buffed allows her to sweep aside a huge proportion of the cast. With Draconic Aura charged, that list grows even further, even defeating some of her counters. Drive Atk 2 provides additional support to all team compositions to give her use outside of cavalry teams. Hardy Bearing allows her to tear through pesky Vantage units fearlessly.