Zybr
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If they align in concept, then it definitely isn't Sion, as his concept is quite different. The only ones with a similar defensive concept are Garen and Kayle, but Revan-Kayle went to Tox.
I'll explain in detail: in both descriptions, everything revolves around protection, re-aggro, and so on. There are no visible magical manipulations, and I think any chronoshifts and the like would have been described.
From all this, we can conclude: now, thanks to Ment's efforts, Morning will have to be saved at night.
Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!