But it would be one thing to deal with the Ten Thousand Beasts Demon Monarch, yet that Purgatory Demon Monarch has some grudges with them, or rather, the Purgatory Demon Monarch has quite a grudge with Xue Wuheng.
Back then, when various forces returned to the Ancestral Land, members of the Purgatory Sect descended into the Demonic Cult, intending to annex its power. However, in the end, Xue Wuheng took advantage of the situation like a fisherman reaping profits, losing both wife and soldiers, which led to grudges between the two sides.
Of course, this was also why, being targeted by such a force, Xue Wuheng had no choice but to agree to Zhao Baiyang's request and choose to join the Heterodox Alliance.
Even later, it was only with the mediation of the Shenxiao Sect that the war between the two sides was temporarily extinguished, yet that hatred is still unresolved.
