Thinking of a way to explain the concept of soul crystals to this dumb human, he finally responds "The soul crystals are concepts given form. Imagine this, you live your life and come to understand gravity, your soul will remember the purest conception of gravity that you could think of. This understanding will build if you study gravity or If you interact with gravity in a certain way such as being a physicist. If I were to use the crystal as a catalyst of sorts, I will be able to do amazing things. I could take the concept of gravity from the crystal and create a black hole. How about an easier example? Do you know how to cook? If so, imagine that I use the concept of cooking. I could use the crystal and make the best possible food from your souls conceptual knowledge of it. The more knowledge and understanding of the concept would make the food better and better giving it special properties such as healing or stamina regeneration. If I collected enough or a purer quality then I could make an golden apple of eden or even more overpowered food."
Garrett immediately asks a horrifying question. "If you take the concept from my crystals... won't that take away my being?!" Looking paler and paler as the truth of how valuable those crystals are for him, not recognizing how dumb he sounds to Antioch.
Antioch takes a second to appreciate how stupid this human is. He didn't know why Garrett was so scared, just because he took the crystals now doesn't mean he will lose the knowledge or something like that. The soul remembers everything, even as a newborn. Garrett would still have important memories.
The crystal is just the runoff from the deaths of beings. The soul will eventually transform into the crystal keeping only the purest possible version of the souls Leftovers. He would have just become a fossilized fuel for this universe to build upon. It would take the crystal and use it to either deepen the foundation of it or the runoff energy would make new life with the concept, such as making an ocean or Kickstarting some animals evolution.
Antioch knew that this crystal is what humans and other beings worship as God, even though it's just a natural cycle of death, growth, life, and back to death, creating a continuous loop. He tells Garrett this making him relax. He immediately grabs the crystals and says "Alright human, it's time for your last gift before I send you away. Stand right there while I create the blueprint. It will take about 15 minutes so I would think about the appearance you want in the next life, I'm allowing you to choose the appearance only because you didn't wish for anything impossible." he finishes with a smug look, knowing he just gained alot of soul crystals for such a small amount of payment.
Garrett sags in relief as he won't suddenly become just a shell of a person without any knowledge. Looking closely he waits as he was told to do. He knows not to talk and just sits there quietly. Antioch immediately floats the crystals to himself and examines them, he knew that this could decide what the humans next life will be like. He gets it done quickly causing a bright light to build before the sound of shattering glass is heard. When the light dies down he is faced with roughly 75% of the crystals left and a tiny floating orb. It's color is so clear that it is almost invisible, if not for the royal purple in the center that seems to pulsate. Letting it float there he points it at Garrrett causing it to shine on him for the next 15 minutes before suddenly enters his soul. Looking closer we see Garrett's soul form with the orb in the center of his heart. Having the sudden addition to his soul, Garrett immediately collapses unresponsive. Antioch approaches the soul with an unrepentant grin exposing razor sharp teeth saying "Finally, I thought he would just take his wishes and leave! Pretty cautious for a lazy human. I almost feel bad for only using a quarter of the crystals... almost, haha. Now to set up his appearance and send him on his way" laughs Antioch. He wanted to return to his lab to tinker with some of the concepts he's received. He already knew what the human wanted so he grabbed Garrett's leg, opened a portal. Looking through, we see a women about to give birth in a hospital. Picking the human up, Antioch tosses him in and closes the portal before opening another and walking into it. Closing the last portal , the void quickly gets swallowed up by darkness and silence once again