Who brought this bandit into the Immortal Cultivation Realm?

In the chaotic era, there was a bandit king named Wu Feng. He clawed his way up from a mere lackey to the throne of banditry, treading upon mountains of corpses and wading through seas of blood. Then, an immortal cultivator appeared and revealed to him the existence of immortality. Without hesitation, Wu Feng severed all mortal bonds, and strode into the immortal realm, carrying with him the unyielding aura of a bandit. Little did the immortals know, this would be the beginning of their worst nightmare. To attain immortality, Wu Feng stopped at nothing to seize every opportunity. He showed no mercy to his foes, trampled over the remains of his rivals to climb up the ranks, and carved out his place in the immortal world through sheer slaughter. He rejected the righteous path, cared nothing for the glory of immortals, and walked his own immortal journey with the ruthlessness of a bandit, paving his road to eternal life with rivers of blood. In the end, he became the dreaded Bandit Immortal, a name that struck fear into the hearts of all. A warning echoed throughout the immortal realm: do not, under any circumstances, cross that bandit. And a question lingered in many minds: who was the fool that let this bandit into their world?