Order | Striker | Support DPS | Mental
Treat her as a fast control-oriented damage piece rather than a pure finisher. From there, move into the PvP tempo route once the core stat line is stable.
Seira feels best once ATK%, Speed, and Crit Rate are online, giving the first rotation a much steadier payoff.
Skill investment is cleanest as Special >= Ultimate >= Basic, with the first cooldown setting the pace for the full rotation.
Lead with the highest-invested cooldown so the opener starts on the strongest possible breakpoint.
Ultimate is usually the next meaningful breakpoint once the opener lands and should carry the mid-cycle payoff.
Use Basic between cooldowns while you keep ATK% and Speed stable on gear.
Budget target is 3 / 6 / 3, with 7 / 7 / 10 as the long-term skill finish.
Start on the Control support line with Insight (4pc) + Hit (2pc) and Speed necklace and ATK% ring. Move into the PvP tempo route once the baseline is stable.
Control supportControl support
Insight (4pc) + Hit (2pc) Control support keeps SPD on the necklace and ATK% on the ring.PvP tempo
Speed (4pc) + Valor (2pc) The PvP variant keeps her fast and disruptive rather than turning her into a raw damage dealer.Priorities
Target Stats
Lock Speed necklace and ATK% ring, then stack ATK%, Speed, Crit Rate, and Crit DMG through substats.
Upgrade Path
Journey: Hard
Core line: Lacy and Bunny Frey. Fill the remaining slots with Lyn Card or Bunny Claire, Charlotte, and Petra or Naru.
Lacy Core 
Bunny Frey Core 
Lyn Card Flex 1 
Bunny Claire Flex 1 
Charlotte Flex 2 
Petra Flex 3 
Naru Flex 3 Skill Cards
Passive
Seira's passive matters more once the core stat line is online and the rotation is already stable.
Basic
Use the basic to bridge cooldowns; it should stay behind the two higher-impact skills in upgrade priority.
Special
Special is the first real investment breakpoint for this build and usually defines the early payoff window.
Ultimate
Ultimate still helps anchor the opener, even when the build upgrades Special first.
