The disappearance of three Grandmasters without a trace is alarming; even top-level forces usually have only one or two Grandmasters. If they encountered the same problem as the Smiling Skull, they would undoubtedly meet the same fate.
For a time, the major forces of the Four Domains, including the Four Domain Cities, began investigating the matter.
However, the final results were inconclusive, but the major forces within the Four Domains believed that Black Obsidian Martial Arts Hall was likely involved. After all, the enmity between Black Obsidian Martial Arts Hall and Smiling Skull wasn't insignificant, and the disappearance of Smiling Skull's three Grandmasters undoubtedly benefited Black Obsidian Martial Arts Hall the most.
Without the Grandmasters, Smiling Skull became fair game for Black Obsidian Martial Arts Hall. If anyone claimed Black Obsidian wasn't behind it, no one would believe them.
