From the Spirit Panel
Every once and again, where starlight falls to ground there arises a new Spirit. Its essence is initially that of the stars and nighttime sky, but from the moment it touches the island it begins to change, adapting and reimagining itself for its new home. Only a few of the island's Spirits came to be in this fashion, but many of them have been memorable.
This one arrived after the Invaders started to spread, striking the earth where they had cleared land for farming. Fragile and new, it was saved from dissolution by Stone's Unyielding Defiance, and in gratitude fights the Invaders even as it seeks to define itself.
=Design Lore=
The natural world is not static, and neither are the Spirits. Individuals among them grow and change, both reflective-of and reflecting-into the parts of the world that they embody. Spirits can cease to exist, either slowly fading away, being severed from the vital life of nature, or through the cessation of portions of the world they cannot do without. They can transform, their nature fundamentally shifting. And new Spirits can come into being, either coalescing around the existing, or via the genesis of the new.
Usually, when Spirits arise, they embody or represent something right from the get-go. There is, however, something different and unusual about the light of stars. While there do certainly exist Spirits of the night and nighttime sky, when starlight itself falls to earth (common) and brings a Spirit (much rarer), that Spirit arises unattached to any facet of nature, other than a lingering and fading connection to the stars above. Over its first hours, months, years of its existence, it transforms, forming connections to local places and aspects of nature, becoming something altogether new.
Are the stars themselves immense Spirits, slower-moving than any on the island, but so powerful they create children from across the vast reach of sky? By the time starlight-Spirits understand this question being posed to them, they no longer remember whether it is true.