The Mount Heshan stone's attacks are all-encompassing – every single object under the sky can be hit, it can surely hit its target.
The defense function of the Four Seas Dragon Ball may as well not exist to it.
The Four Seas Dragon Ball has a strong defensive ability but it can't block all attacks.
The aspects the Mount Heshan stone deals with, in terms of crafting methods, excel those of the Four Seas Dragon Ball.
The Sky Desolate Halberd is indestructible. The certainty of the Mount Heshan stone's attacks hitting their marks is no use against it. It's the natural nemesis of the stone - it's logical for the two to aspire to outdo one another.
Logically, the Four Seas Dragon Ball should be able to counter the Sky Desolate Halberd. Once the Dragon Ball develops intelligence, attacks from those below the Immortal level can't break its defense.
None could break the Dragon Ball's defense with the Sky Desolate Halberd during the Transcendance Tribulation Stage.