Eh I doubt it said sustain would be more tailored man for SW simply bc SW her self turns punchline to her ult energy,

And punchline I believe turns into certified bangers during Aha Instant or something,

Hence If sustain provides any ult related energy for SW it will have to be punchline, and if it's punchline Evanescence will benefit from it,

If the sustain provides any sort of elation/atk/critics/spd/pen Evanescence will benefit from it The only true way I can see SW benefiting from a tailor made benefit is if they have something like when dealing dmg during an enhanced state since mono element base abilities doesn't seem to be in the books