Apart from the Great Sage Mu Yuan and the Buddha-Demon, that Tribulation Immortal and Demon Lord Huntuo were also extremely formidable.
They were each pressing down two massive clusters of Demonic Qi as huge as stars in battle, truly worthy of the titles Star Brigand King and Lord of the Demon Abyss, terrifyingly strong.
As for the other two Red Dust Immortals who used the Great Dao to mask their faces, perhaps for fear of exposing their identities, they only used the simplest power of Dao Principles to attack and did not employ Divine Skills or Immortal Techniques. Therefore, the strength they displayed was somewhat weaker, only managing to battle against a single Demon Lord.