PyroisPick #1 of 6 · S1
Free and the best option: unconditional CRIT Rate plus an Ether RES ignore effect that is effectively always up (triggered on entering combat and on Ultimates). There's little reason to look elsewhere; S5 adds roughly 4%.
Effect
Eclipse Effect
CRIT Rate increases by 20%. When the equipper is Pyrois, using an Ultimate grants the Eclipse effect. When the Eclipse effect is active, DMG dealt by the equipper ignores 16% / 17.5% / 19% / 20.5% / 22% of Ether RES, lasting 45s. Repeated triggers reset the duration. When the equipper enters combat, they gain the Eclipse effect.
Values at S1/S2/S3/S4/S5
Who Should Use Sol Exuvia
Ranks and notes come from each Agent's build guide on Zenless Builds.