It was all too easy to make use of the Sacred Master, because the Cosmic Gods all coveted the inheritance of their lineage. And the strongest being in the Chaotic Void, the 'Sacred Master', was the greediest of them all. He had long since exhausted every method—at times threatening, at times tempting, and he had even personally acted against the Red Eyebrow Mountain Lord, killing the Red Eyebrow Mountain Lord before.
Unfortunately, anyone of their lineage who wished to obtain the core inheritance first had to master the 'Avatar Technique'. Thus, no matter what the Sacred Master tried, he could not obtain the true core inheritance of this lineage.
Even one as powerful as the Sacred Master had many areas in which he was not proficient. Faced with the methods left behind by the Nine Cloud Emperor, he still had no way to crack them.