Ace didn't dare to be careless as he walked into the mountain; it was a huge space, and the walls seemed to be carved from green crystals. Furthermore, rune symbols were etched on those walls, creating a grand grade-9 formation.
But this formation wasn't for attacking or defending; instead, Ace found that this formation was keeping all the Qi within this space and stop from leaking. The martial Qi here was extremely dense like he was swimming in it, even the system being to notify him of massive EXP increase in his state.
Soon, Ace found the center of this formation and was astounded when he saw a small green serpent-shaped crystal vein twinkling like stars, and it was the source of the dense Qi!
"What is this? It didn't seem like a Qi stone lode?" Ace muttered in bewilderment.
At this moment, the system's abrupt voice rang.
=====
[System detects a Grade-9 Martial Beast Vein!]