I got her long ago +speed -res and never use her because I have ideal IV and built Karla and Ayra. Is she still worth building? How should I build her? Thanks in advance!
Yeah, Fury/Desperation works with Flashing Blade in the S slot.
If not you can keep Flashing Blade in the A slot and give her Brazen Atk/Res or Atk/Def Bond in the S slot.
She's got real potential honestly. You should see the yt video where akariss solos TT with her alone without summoner support. His build is expensive though, and she's +10.