The Veil
No civilization has ever fully explained it. The oldest records in the Driftway Archive describe it simply as "the breath between stars."
Running through every star system, every inhabited world, and every living creature is The Veil — an invisible resonant field that connects all life. It predates every civilization that has ever mapped the galaxy. It will likely outlast them all.
Scientists have measured its effects. Philosophers have debated its meaning. Empires have tried to control it. None of them have come close to understanding what it actually is.
The closest anyone has gotten: the Veil seems to respond to consciousness. It grows stronger near large populations. It weakens in dead space where nothing lives. When a species goes extinct, the Veil around their home world dims for centuries before recovering.
The most disturbing discovery: in three locations across the known galaxy, the Veil has gone completely silent. Not weakened — gone. Those regions are called the Sundered Reaches. No one who has traveled there has ever come back able to explain what they felt.