For Sett Legend ability, can a buff be spent from anywhere or does it have to be from the unit it's on?

Ruling: The buff must be spent from the unit that has Sett Legend on it. "Spend its buff" refers to the buff on that specific unit, and it only works to save the unit that has the buff, not another one.

Nuances:

• The ability cannot be used to save a different unit by spending a buff from elsewhere