Illusion

Once Elder Chu said that, other elders present in the hall looked at her with all sorts of expressions in their faces.

Then they turned their heads away from her and gazed back at the group of people taking the illusion-based test of perseverance.

...

In Xiao Lin's vision, he found himself in a region that seemed boundless. However, the particular place that he found himself at, was the edge of a massive land that was actually a really large island which was surrounded by a lake of red-hot, churning lava.