If Leona, Radiant Dawn stuns multiple units (via Svellsongr attachment or multiple Leonas attacking, or via Thwonk with repeat), how many buffs are generated?

Ruling: The number of buffs depends on how the stuns are created. Leona's legend ability triggers based on "when you stun one or more" units.

Sequence:

• If a single effect stuns multiple units (like Thwonk with repeat cost), Leona's legend triggers once because it's one spell resolving once with a doubled effect
• If multiple separate effects each stun units (like Svellsongr on Leona creating multiple triggers on the chain, or multiple Leonas attacking), each separate stun effect triggers Leona's legend separately

Nuances:

• A repeated spell only goes on the chain once and resolves once, it just doubles the effect, so it only triggers "when you stun" abilities once
• Multiple triggers that each stun will each go on the chain separately, causing Leona's legend to trigger multiple times