Its icon shows lightning. In the country of Nyralim's embrace, the summer manifests as an immortal Fae. You know her, him, it, as the resplendent warrior or the ardent conqueror. You mortals named him King Ysa. In the youth of your people's memory, you bore witness to Ysa's exploits. He is your...
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Behind the Veil
The Prince of Spring raised his sword toward the breaking dawn, and he called down the glory of the newborn morning.
Ysa bequeathed to the land the Talisman of Fate.
With its power, the earth rose to defend the birthplace of light, our cradle of summer.
So the Great Cycle swathed Ohn of the Thulian Dusk in the Arcane Veil,
and Ysa planted the Gardens after the storm, and nurtured the Court of Summer by the ruins of fire.
The first Summer King. The first Ysa. Created summer, and the morning. The Summer Court represents life and light. The Winter Court represents entropy, winter, and death.
When you start looking at the stronger Celestial's, they really are one of the final bosses of Marvel, they nuked the absolute fuck out of the First Firmament, timelord style.
I always liked the sense of mystery around them, enigmatic celestial's are best celestial's