The Sylvaris Planetary System has 12 planets, ten of which are mining colonies. They are perhaps the most valuable planets in the system, so they are protected by some of the most advanced shields and weapons.
Because of this, when the demons attacked, they couldn't breach any of them.
As a result, they turned to the two remaining planets that housed the miners and their families.
Planet Sorat is the largest planet within the Sylvaris Planetary System, and it was the planet the demons attacked first, since it gives them access to the most leverage.
The elves made a quick rescue on the second planet, but before they could get to Planet Sorat, it had already been engulfed by the Spatial Domain owned by the Ebon Sovereign.
This left Planet Sorat and its 640,000 inhabitants at the mercy of the 85,000 demons.
Every effort made by the Elven Empire and the hunters who took on this mission failed. Later, it was discovered that whenever a mission failed, more elves were killed.
