Chaos | Ranger | Debuff DPS | Mental
She rewards players who build for speed and control rather than only raw damage. From there, move into the Endgame route once the core stat line is stable.
Lydia feels best once ATK%, Crit Rate, and Crit DMG are online, giving the first rotation a much steadier payoff.
Skill investment is cleanest as Ultimate >= Special >= 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.
Special 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 Crit Rate stable on gear.
Budget target is 3 / 3 / 6, with 7 / 7 / 10 as the long-term skill finish.
Start on the Core line with Insight (4pc) + Hit (2pc) and Speed necklace and ATK% ring. Move into the Endgame route once the baseline is stable.
CoreCore
Insight (4pc) + Hit (2pc) Core keeps SPD on the necklace and ATK% on the ring.Endgame
Precision (4pc) + Hit (2pc) The endgame version doubles down on debuff reliability and action control.Priorities
Target Stats
Lock Speed necklace and ATK% ring, then stack ATK%, Crit Rate, Crit DMG, and Speed 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
Lydia'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 next major breakpoint after the opener and usually carries the mid-cycle payoff.
Ultimate
Ultimate anchors the opener and stays at the top of the investment order for this build.
