Jhin & Xerath Synergy
Jhin ADC and Xerath Support win 51.6% of 15,628 Low Elo games together, +1.2 points vs expected, 2-patch window 26.19-26.20.
Researched on LoL patch 26.20. Tips are written to hold at any rank; stats come from Low Elo ranked games up to patch 26.20.
Why this duo works
Xerath can damage or stun a target from range to enable Jhin's Deadly Flourish root, and their long-range ultimates can pressure the same retreating target from different angles. The pair is +3.3pp in High Elo over 3,904 games, compared with +1.8pp in Low Elo over 9,634 games.
Measured in High Elo: this duo wins 2.4pp more often than expected over 3,904 games.
Playing the duo
When a target is low or retreating, coordinate Curtain Call and Rite of the Arcane from different angles; Jhin's slow can make Xerath's barrage easier to land.
Xerath's damage and Shocking Orb stun can enable Jhin's Deadly Flourish root, which gives the pair a long-range crowd-control chain.
Curtain Call and Rite of the Arcane can both threaten low-health enemies from far away, and Jhin's hits slow targets for Xerath's follow-up barrages.
How to play as Jhin
Use Xerath's stun or spell damage as the cue for Deadly Flourish; the long-range root lets both of you keep hitting without walking into the enemy engage range.
Sources
These notes come from r/JhinMains, checked against the champions' abilities.