Ashe & Seraphine Synergy
Ashe ADC and Seraphine Support win 52.2% of 25,395 Low Elo games together, +1.5 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
Ashe's repeated slows make Seraphine's Beat Drop(E) a root, and its echoed hit can stun a target already rooted. Ashe can also follow Seraphine's Encore(R) with her own arrow, giving the duo a reliable long-range chain of crowd control and poke.
Measured in High Elo: this duo wins 2.1pp more often than expected over 13,541 games.
Playing the duo
Ashe's attacks and Volley(W) slow targets, allowing Seraphine's Beat Drop(E) to root them; if an echoed E hits a target already rooted, it can stun them.
How to play as Ashe
Slow a target with an attack or Volley(W) before Seraphine uses Beat Drop(E) to set up its root. If Seraphine lands Encore(R), follow with Enchanted Crystal Arrow(R); wait out Cleanse first if the enemy has it.
How to play as Seraphine
Wait for Ashe's slow from attacks or Volley(W) before using Beat Drop(E); it can root the slowed target, and an echoed hit can stun if the first E has rooted them.
Sources
These notes come from r/AsheMains and r/SeraphineMains, checked against the champions' abilities.