Seclusion.

Sasha, the elf who greeted You Xi Wang and the others near the big holographic tree was leading them again. Their destination was the underground spirit lake. You Zhichi asked Sasha, "Lady Sasha, can you tell us how the underground reservoir is formed?" her soft voice echoed slightly throughout the passage.

Sasha who was walking ahead spoke in an equally soft tone, "This passageway actually used to be occupied by the roots of our sacred tree. The tree withers after a millennium. The elders that time collected the seed of the sacred tree and they planted it inside the forbidden grounds of the Elves. These underground passageways remained the same after the roots were collected. All the roots of the sacred tree combined and gathered together at the end. This end is where the spirit energy was dumped and stored by the Fallen prince. That is where the spirit energy turned into spirit lake over the years."