Black Knight
They walked for a few minutes, crossing multiple tunnels.
Theo kept pushing back all the imps they encountered with Ava on his shoulder.
Since there was no more danger with Theo around, the guy continued leading them for another fifteen minutes before they saw a light inside the tunnel.
They were never climbing up, so it was weird to see a light in this dark place, but Theo and Agata followed him while Ava kept listening to the sound, making sure there was no one hiding in that place.
If there was a trap, Theo had prepared to use his Blink. Even his clone had turned into an ant and stayed on Agata's shoulder.
They approached the light carefully before they were close enough to discern what kind of light they saw this whole time.
"A glowing crystal…" Theo and Agata frowned and said at the same time.