Quid Pro Quo
Quid Pro Quo is a 4★ Light Cone for the Path of Abundance in Honkai: Star Rail.
As a 4-star cone, its passive of restoring 8 Energy each turn to a low-Energy ally speeds up the team's ultimate uptime, making it a solid pick for Abundance Path units, though it remains an indirect support effect rather than a top-tier signature piece.
At the start of the wearer's turn, regenerates 8 Energy for a randomly chosen ally (excluding the wearer) whose current Energy is lower than 50%.
After enjoying an intense massage from the dragon girl, the foxian girl held out her hand and playfully pinched the dragon girl's little chubby cheeks. The little girl then pouted her lips, clearly offended, only to elicit a gleeful giggle from the foxian girl. "Now that's what I call a proper quid pro quo."
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.