The corridor led them to a vast underground cavern, filled with lush vegetation and a network of small streams. The cavern was lit by glowing crystals embedded in the ceiling, casting a soft, ethereal light that reflected off the flowing water. It was a beautiful and unexpected sight, a hidden sanctuary deep within the labyrinth.

"Wow," Aiko said, his eyes widening as he took in the view. "I didn't expect to find this down here. It's like a whole other world."

Haru was equally amazed, feeling a sense of tranquility in the cavern's serene atmosphere. The lush vegetation and gentle streams created a peaceful environment, a stark contrast to the dangers they had faced so far.

As they explored the cavern, they discovered a small stone altar at its center. The altar was adorned with ancient symbols and surrounded by exotic flowers. It seemed to be a place of reverence, where the ancient civilization had once conducted rituals and ceremonies.

Aiko examined the altar, noticing a small chest hidden beneath it. "Looks like we might have found something interesting," he said, reaching down to open the chest.

The chest contained a collection of ancient artifacts, including a beautifully crafted amulet and a scroll with intricate calligraphy. Aiko carefully picked up the amulet, noting its unique design. It was shaped like a phoenix, with vibrant red and gold colors that shimmered in the cavern's light.

"This must be one of the temple's relics," Aiko said, holding the amulet up to the light. "It's beautiful. What do you think it does?"

Haru examined the scroll, which contained a detailed map of the temple and the surrounding labyrinth. The map indicated several hidden chambers and secret passages, suggesting that there was more to the temple than they had initially thought.

"We should take these with us," Haru said, rolling up the map and placing it in his pack. "They might help us find our way through the labyrinth."

As they prepared to leave the cavern, they heard a faint rustling sound from the shadows. Haru and Aiko exchanged a quick glance, knowing they weren't alone. The peaceful sanctuary was hiding its own secrets, and whatever was lurking in the shadows wasn't going to let them leave without a fight.