Old Worm

Su Xiao surveyed the basement. When he had just entered this Derivative World, a malicious gaze had fixed on him. After seeing who that gaze belonged to, Su Xiao had a rough idea of what was going on.

This time, he had replaced the Berserker class—the same Berserker he had fought before, Lancelot.

Killing Lancelot had earned Su Xiao no rewards. It had been a trial: killing Lancelot allowed him to replace the other party's class, while failing to kill him meant being trapped in the barrier forever.

The Derivative World Su Xiao had entered this time was not small, but the battlefield itself was limited to a single city, and the main storyline was simple.

Two hundred years ago, the three great Magus families had joined forces to summon the Holy Grail in pursuit of the Root—the dream of every Magus. The Holy Grail was an "omnipotent machine" capable of granting any wish.

Three Magus families had participated in the undertaking, but there was only one Holy Grail, so the conflict between the three families intensified.

After a series of struggles, the three families reached an agreement: they would determine ownership of the Holy Grail through a small-scale competition.

The First Holy Grail War officially began. The rules were still incomplete at the time, and the three Magus families fought with extraordinary ferocity, but all of them ultimately ended in failure.

Once the First Holy Grail War had drawn to a close, sixty years passed, and another Greater Holy Grail was about to appear.

By the Second Holy Grail War, its rules had become increasingly complete, and its impact on the world's structure had consequently diminished.

However, the three great families still refused to follow the rules. Although the Command Seal system had been completed, this Holy Grail War