Star Lord Hao Yue is annexing the Soul Breaking Demonic Sect, not merging it.
If it were merging a Great Teaching, like when Cao Zhen merged the Ten Thousand Immortals Sect, it would take a longer time to preserve the many Immortal Mountains and buildings.
But annexing a Great Teaching doesn't require keeping any of the original Great Teaching's Immortal Mountains, only absorbing its destiny and history!
Cao Zhen remembered that back then, he used the Instant Millennium Pearl to merge the Ten Thousand Immortals Sect, taking two hours, while now, Star Lord Hao Yue only took an hour.
Back then, he used the Instant Millennium Pearl, and the entire Ten Thousand Immortals Sect entered the Instant Millennium Pearl, whereas, right now, the Soul Breaking Demonic Sect hasn't entered Star Lord Hao Yue's Instant Millennium Pearl.
The Soul Breaking Demonic Sect is still before him, yet he clearly feels that the Soul Breaking Demonic Sect has become different.
