Where did the dark crystal go?

[DamianFatale]

It is located beneath the arena and is briefly visible during each time he spins it.

OH, I never noticed that! Does anyone have any screenshots? I also wonder if his crystal still exists, because the mother crystal did at least until we fed its aether to the spaceship. I could see the dark crystal coming up in a plotline later down the road. The moon can't just run out of uses can it? There has to be more in store for it.