Leona

Legend · PassiveWhen you stun one or more enemy units, buff a friendly unit. (If it doesn't have a buff, it gets a +1 Might buff.)

Leona stuns, then buffs. Every enemy she stuns — with her attack, Rune Prison or Solari Chief — lets Radiant Dawn buff a friendly unit, and a stunned unit deals no damage — her trials teach you where each stun and each buff goes.