Majestic griffin on the highest spire of a tree city

A majestic griffin, with feathers like stained glass and eyes like molten gold, perches on the highest spire of a city built into a colossal, ancient tree. Below, rivers of starlight flow through the branches. The style is highly detailed digital painting, evoking the epic fantasy illustrations of artists like Greg Rutkowski and the imaginative world-building of James Gurney.