When an enemy Yasuo Champion (who deals his might as damage when attacking) attacks into Ahri Legend (who gives -1/-1 when an enemy unit attacks), does Ahri's trigger resolve first to reduce Yasuo to 6 damage, or does Yasuo deal 7 damage first?

Ruling: Ahri's trigger resolves first, reducing Yasuo's might before his damage trigger resolves, so Yasuo deals 6 damage instead of 7.

Sequence:

• Enemy Yasuo attacks, triggering both his "When I Attack" ability and Ahri's "When an enemy unit attacks" ability on the Initial Chain
• The attacking player (turn player with focus) adds their triggers first (Yasuo's damage trigger)
• The defending player adds their triggers second (Ahri's -1/-1 trigger)
• Triggers resolve in reverse order (last in, first out), so Ahri's trigger resolves first
• Yasuo is reduced to 6 might, then his damage trigger resolves dealing 6 damage

Nuances:

• Ahri's Legend trigger is not a "When I defend" trigger, but it still follows defender timing because it's controlled by the non-turn player
• All Initial Chain triggers controlled by the defender can be ordered together, regardless of whether they say "when I defend" or "when an enemy attacks"
• The ordering is based on who controls the abilities, not the specific wording of the trigger condition