Who On Earth Are You?

Regardless of the fact that the immortals and demons of the Lost Immortal Region could contend with the army of the Immortal Race for a period of time in the Lost Immortal Region, when the various organizations hid separately and were found one by one, they would basically be surrounded and suppressed and easily eliminated. 

Those organizations that withdrew to the Demon Region were not besieged by the immortal army in a short period of time, but it was estimated that the Demon Region would not let these traitors go.

Moreover, this time it was mainly to deal with Mo Xiu, and it was not only the Immortal Race that wanted to deal with Mo Xiu, the demons of the Demon Region even wanted to kill Mo Xiu, so they wouldn't make those organizations better, anyway.