The mightiest of objects that Eternity guards, the 'crystals' of eternity are manifestations of time itself. Each 'crystal' is a necessity of creation, existing only to guard aspects time that cannot be broken or undone. Each of them can transfer its gifts as Revni so wishes: every few millenia, a 'crystal' changes to something new. When first found, the shape of the object was a crystal and a such it has become through history to be known as Crystals of Eternity despite not often being jewels themselves. Capturing and learning to use one, provides possibilities ranging from liberation to guardianship and control itself.
The Crystal that was seen on Earth (visualized above at dawn and dusk) was a cage that held Daniel's body captive as Revni existed in his place. When he emerged, anew and fully belonging to and with Revni, as One-True, the crystal itself melted into the spindrels and muck that became unto him the costume and essence of his gifts.
Forgotten Home ∅ Crystal Star ∅ Orb of Forgivness
Altar of Aeons ∅ Burning Bijou ∅ Helios Orbit