Past Self in Mirror
Past Self in Mirror is a 5★ Light Cone for the Path of Harmony in Honkai: Star Rail.
A 5-star cone that both massively boosts the wearer's Break Effect and grants a team-wide DMG buff plus team energy regen on Ultimate use, making it a best-in-slot, essentially irreplaceable pick for its intended playstyle.
Increases the wearer's Break Effect by 60%. When the wearer uses their Ultimate, increases all allies' DMG by 24%, lasting for 3 turn(s). If the wearer's Break Effect exceeds or equals 150%, 1 Skill Point will be recovered. At the start of each wave, all allies regenerate 10 Energy immediately. Abilities of the same type cannot stack.
She once loved to seal the moment when plum blossoms were on the verge of wilting and keep them close to her. It has been many years since then. Many lifeforms — rambunctious, sweet, and everything in between — have bloomed from her hands, but the plum blossoms still wilt at their preordained times. It has been many years since then. Her visage in the mirror seems untouched by time. But, in the grand scheme of the cosmos, is she too destined to last for but a fleeting moment? "If all is set for eventual demise, what purpose, then, does creation serve?" After a silence that seems to stretch to eternity, the winds blow, the petals fall, and the reflection in the mirror tenders the same answer as always. "For the day when plum blossoms are no longer kept." She deftly caresses the icy surface of the mirror. Such soliloquies have happened too many times for her to count.
How to read this Light Cone page
Every Light Cone has exactly one passive effect tied to the wielder's combat performance; that effect scales up as you Superimpose it from S1 to S5 — use the S1-S5 buttons above to see the exact numbers at each level instead of guessing or interpolating. A Light Cone only delivers its full value on a character who shares its Path; "Characters who use this cone" lists every character on that Path, while "Best users" is a narrower list pulled from real build consensus, not a guess.
Base stats (HP/ATK/DEF) are shown at Lv80 for every cone of the same rarity so they can be compared directly; a 5-star cone will always edge out 4-star and 3-star ones here — the real difference lives in the passive effect, not the flat stats. The "Alternative cones on the same Path" section suggests a few other options if you do not own the signature cone yet, or want to compare before spending ascension materials.
See the full list on the Light Cones page, or check terms in the HSR Glossary.