Long ago, many worlds were connected by ancient gateways known as the Thresholds. These crossings allowed travel across planets and time, uniting distant civilizations. Through the Thresholds, races traded knowledge, formed alliances, and fought wars that shaped the universe together.
At the heart of this network stood the First Vault, hidden deep under the Sun-Buried Bastion, a fortress system swallowed by endless sand. The First Vault was not a gateway.
It was a seal — a prison built to contain forces too dangerous to destroy. These powers threatened all worlds equally. If the seal ever broke, what was held inside could spread through the Thresholds, moving from world to world until nothing remained.
Its guardians were the Titan Hybrids, a stone-bound civilization known for endurance, strength, and duty. They remained at their post, holding the seal through silence, sacrifice, and time. For ages, the Vault held. The Thresholds endured.
Then the first signs of fracture appeared. Something began to seep through the network. It did not cross the Thresholds like a traveler. It leaked through them like a wound opening between worlds. A force unseen in earlier eras, arriving without warning and without form.
Wherever it touched, space twisted, memories broke, and intention itself became unstable. Some races described it as living shadow. Others as a presence wearing forgotten faces.