How should I build Bridel Cordlia

Its usually how you want to build her. If you got a spd boon and enjoy attacking a lot times then go brave bow for a quad build. If you want to secure kills and also not risk taking hits then go firesweep.

Firesweep is better if you have it. Brave bow just doesnt hit hard enough and also you get counter attacked.) in any case, if you dont have her heavily merged, I dont really see the point of investing 20k feather for her weapon and then another 20k feather for LnD

Although this is off topic for the 2 weapons, id rather say stick with your cupid bow and refine it. Ive seen alot of promise making Bridal Cordelia on support than attacking (yet she has to attack to buff herself and allies +5 def/res for the whole turn lol, but eff can activate on either phase). I use LaD 2 (dont need 3 if shes +atk IV, it hits at 54 atk), desperation(can also run renewal), and BoL with BoL seal. Then id give her ardent sacrifice to trigger desperation(or renewal to safe heal if she has an ally to deal with DC units). Made this as a TT/arena support for my armor team and it works well and creative outside her meta standards. Still working her up ^^