Serenity had been bound for quite a while.
It was on that day when Skullius had conversed with Aurolio for the first time, getting enlightened on what was truly going on: the value of the Book of Alignment; the complexity of the Existential Parallels; the obscure, but essential prize buried in Rich worlds.
That was day when Serenity's presence had been sealed by Aurolio.
She had been trying to warn Skullius about interacting with another bearer of an Existential Parallel.
Skullius had met one before, well two, and Serenity knew, but because Skullius was so weak back then, she couldn't intervene.
Even if she could, Elita was just like Skullius at the time. She knew nothing about Null Life Essence and Voided Death, was thus, harmless.
The other, well...