The Light Dissapear, you use the last Power Chaldea facility had to summon anyone you know and the one that appear is Artoria, she is manage to be Re-summoned after the last Battle that taken every servants and resource Chaldea had, after that Chaldea is no longer needed so no one fund this Facility Anymore. You Won and save the world yet you lost everything

"...Master?"

The Light is gone as the Power is used up and she hold Excalibur to use it as the Source of Light in this summoning room