At the end of the corridor, Shard felt a familiar sensation not only because of the White Mist Gate in front of him but also because he had seen this corridor before.
Through the gift of the Father of the Infinite Tree, he had learned the truth about the Witch War of the Fifth Era: it was two witches who tried to end the Fifth Era using the power of the Witch Council. And at that time, the two beautiful ladies had entered the Council through this very corridor that Shard and Miss Aphrola had just walked through.
Therefore, what lay beyond the White Mist Gate in front of them must be the Witch Council.
To use the Time Corridor, one needed a "time" Spirit Rune, Spell Words, and a Time Key.
To use the Spatial Labyrinth, one needed a "space" Spirit Rune to open the walls, had to touch the Ancient God Statue, and recite Spell Words.
To use the Judge's Court, one required a "balance" Spirit Rune, an Ancient God's Holy Emblem, and Spell Words.