Which champion generic awakening stone - low sig - Rank 3

Any opinions on which 6* champions benefit the most being awakened with only 1 sig and worth the generic awakening gem AND worth taking to Rank 3 ? I have no sig stones, so I’m talking about a noticeable advantage to just the Awakening and worth a GENERIC awakening gem.
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Signature Ability gives him Damnation - which allows him to Fate Seal and Heal Block on top of the Power Lock. It's incredibly powerful as it gives him stronger Buff control than a majority of Mystic champs. The Heal Block is really nice, too.
Only needs Sig 1 btw. More Sigs just add some Damage Over Time.