Barrier blade is not the best option for swords as the strongest mages in the game are blue, and Slaying edge is the better choice in most cases.
I also pulled my first Silvia today, and she had perfect IVs with +spd -res, too bad I already have a 4*+10 Olivia who is way better, maybe I'll 4*+10 her for AA when I'll have the copies
Well I mean I wouldn't be putting her up against blue mages in the first place unless she has her special up and is capable of ohko with it with vantage
I also just like to build rather strange sets for units even if it's not their strongest feature, he'll my 5*+10 -Res F.Corrin usually ends up always running LB on her just because I like being able to counter attack from 2 spaces even if her res is complete shit
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