Does Unyielding Spirit prevent damage from Last Breath effects that say 'it deals damage equal to its might'?

Ruling: Unyielding Spirit does not prevent damage from Last Breath effects when the text says "it deals damage" because the unit itself is dealing the damage, not an ability.

Nuances:

• This works the same way as Challenge damage, which also cannot be prevented by Unyielding Spirit because the units are dealing the damage
• This is different from ability damage like Yasuo's ability, which can be stopped by Unyielding Spirit because it is ability damage rather than the unit dealing damage directly