While Lu Yun and the others were still farming Corrupt Mummies in the Desert of the Corruption, Zhao Hao had already advanced deep into the underground Corruption, using the Prawny Hammer to shatter the Demon Altars.
Before he set off, Lu Yun had told him, "Go ahead and smash a bunch of them, it's totally fine. In the current version, smashing altars won't randomly generate evil blocks anymore."
Since Lu Yun said so, Zhao Hao proceeded to smash every single altar in the left-hand side of the Corruption.
Chapter 149