|Build designed around using Brazen Cat Fang's built in Atk/Spd Solo effect to the best it can be.
Shove and Smite are both used to give more movement capacity, by moving allies away from ideal spots so Lethe can keep her Solo boosts.
Moonbow and Glimmer are important as a Lethe needs a fast charging special.
Spd/Def Solo 3 is used to increase Spd to the point where Lethe can get multiple attacks before an opponent can, and allows Lethe to survive a hit better.
Vantage 3 is important as Lethe cannot survive multiple attacks, and Vantage allows her to defeat foes before they can attack.
Hone Atk 3 is the boost I run, but depending on how you use Lethe it can be Flexible. However it is useful to be able boost allies when Lethe alone cannot deal with an enemy.
As for Seals, they can again be Flexible, but Speed +3 is useful so that Lethe can get multiple attacks even around an ally.