Karthus & Jhin Synergy

Karthus Jungle and Jhin ADC win 49.3% of 2,173 Low Elo games together, +0.8 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

Karthus's global Requiem(R) can damage enemies anywhere on the map and prime Jhin's Deadly Flourish(W) root. If a struck target is visible and within Jhin's W range, Jhin can turn that global damage into a long-range catch; Jhin players describe this same setup with other global ally damage.

Measured in High Elo: this duo wins 1.5pp more often than expected over 1,738 games.

Playing the duo

Requiem(R) damages enemy champions globally; a target it hits can be rooted by Jhin's Deadly Flourish(W) if the target is visible and within Jhin's 3,000 range.

How to play as Karthus

Ping Requiem(R) before its damage lands so Jhin can hold W for a visible target in range; the follow-up root can turn your global hit into a catch.

How to play as Jhin

When Karthus starts Requiem(R), wait for it to hit. If a struck enemy is visible and within Deadly Flourish(W) range, follow with W to root them for your team's next hit.

Sources

These notes come from r/JhinMains, checked against the champions' abilities.