It's worth mentioning that Tongshen Mountain has already lifted the power suppression on Mu Can and a few others; otherwise, sending them to challenge a Void Level creature with only the peak strength of Martial Arts Sect would be no different than sending them to their deaths.
Even so, facing such a creature, everyone still felt the difficulty of the situation.
If this big guy were to be thrown into the Mortal World, there would be no need for the current struggles there. Within the Mortal World, neither the forces of Mortal World nor those from the Immortal and Demon Worlds could produce a Void Level expert. Everyone is now striving to ensure that the first Void Level expert to emerge in the Mortal World comes from their own side.
Mu Can's purpose here is precisely for this goal. As long as Mu Can can successfully step into the Void Level, the threat from the Demon World and Immortal World would be utterly insignificant.
