Global Class Change: Am I the Only One Who Can Use Immortal Arts?

A fantasy game descends upon the real world. Countless portals appear, leading to thousands of different realms! Terrifying monsters rampage across the land, and people fight hard to kill them, level up, and change classes to grow stronger! The Blue Realm enters an age where everyone changes class to fight the monsters! On the day of his class change, Liu Yi awakens the Ancient Cultivator class, said to be the most useless of all! According to the records, this class has no magic power and can't learn any skills. But it seems... I'm the only one who can use immortal arts?