The summoning ritual concluded in silence. It was so eerie it was almost abstract. Hearing nothing except the sounds that your living and breathing body makes was always unnerving to Zion since none of those sounds existed naturally in the cadavers they inhabited. There was a lot of effort and magic that went into the illusion of life that was too exhausting to maintain when orchestrating such an intense and complex ritual.
While they were free of the needs of life (no need to breathe, eat, sleep, etc, because there's nothing to keep alive) they were encapsulated in the constant reminder that they were no longer alive, while at the same time incapable of being released by death. Animating a body would often cause residual cravings just as a certain perspective can generate a specific image. How the body felt, what it had been through, these effects carried over and could distort or transform the experience of the occupant. While that middle ground they occupied was essentially predestined, that in itself made it all the more painful. Even when you might have enough agency to manipulate the laws of nature and change bodies like clothes, if this ability was bestowed upon you by Fate it hardly seemed like agency at all. What's more, maintaining sanity as a lich becomes exponentially difficult the longer you are undead. Being constantly uprooted and replanted in different bodies had a similar effect on the soul as it would on a tree. Moreover, the sense of yourself that you get and keep being housed in one body rapidly deteriorates. The different experiences inevitably change you, and whatever you were never remains the same. In that sense undead is also still dead and dying again and again.
Medora never wanted to become undead, but Fate had determined she would in order to usurp the powers of Luck. And what Medora did not want, Zion knew could not be undone. While the the soul might be animate in a manner of speaking, the transition from alive to undead inevitably killed Medora, and what resurrected from her smoldering ruins was Zion. Whatever was before ceased to exist, and whatever rose up through the ashes had been unmistakably altered. For this Medora could never forgive, and for this Zion would never fully forget.
If you think of a soul as the thing that holds a body together like thread binds a garment then you can understand how bodies rot after their respective souls depart. While a lich will bind their soul to a body, the soul is still housed in a phylactery. This allows the soul to move from body to body, but it also prevents the body from being nourished by the soul. As a result the body a lich inhabits will still deteriorate. While it will rot more slowly than a corpse because there is a soul somewhat bound to it, it will eventually turn to dust and a new body must be found. And just like anything there are things that can accelerate or decelerate this process.
Sitting in the circle in the suffocating silence Zion waited. First, synchronous, but still as if by chance, damp leaves fell from the tree above and put out each of the 8 lit candles one by one in a line. As the leaves accumulated on the ground with water the same breeze that gently plucked them from the tree stirred them on the ground and they took flight in the wind. A leaf here, a leaf there, all scattered to far away places. That movement would come back though, whenever She would arrive.
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Lucky had now seen resurrection thrice. First she saw Zion resurrect themselves, then she saw Zion resurrect Corvis, but now she had just seen Corvis resurrect Zion. Things that she never knew were possible had been done with ease by those she never fathomed had the capability. What's more, she had these creeping feelings that she was unaware of her own potential given her other form.
Zion felt odd and off to Lucky as well. Before when the lich had held her she felt a certain warmth and earthiness, but the hand that was holding her now felt cold and empty... like a mirror. She chirped her question through stuffed cheeks.
Zion looked at her with eyes glowing ember that had a quicksilver reflective quality to them unlike before. Lucky felt a strange pull from those eyes, like their emptiness was pulling her in. When she realized what was happening she chirped an alarm. Zion's countenance went from affectionate to dissappointed.
"I'm sorry, I didn't mean to scare you. Not having a human body makes me seem cold. I'll have one again soon enough, but I promise you regardless of my form I won't ever forget how special you are." The lich reached into their cloak and showed Lucky a tiny charm. With a few gestures the harness from Lucky's leash appeared and Zion attached the charm. They mumbled a few words and the harness with charm materialized on Lucky. "This will help you hide yourself when you change forms, it'll also help you better control your shifts, but it has its limitations. I'll catch up with you in a bit and fully answer your questions. Corvis and I just have to do a few things first." And just like that Lucky was sitting alone outside the vent to Cerberus's cell. The only evidence she'd been anywhere else was the charm around her neck and the missing go piece.