The Heavenguard Sect was a faithful follower of Dark Crow and under his banner it participated in many conquests and battles against the Ancient Ming. Countless geniuses fell in those battles; the Heavenguard Sect paid a heavy price after each war.
Eventually, Dark Crow felt too remorseful for their losses and never returned to the Sect again, as he no longer wanted them to follow and die for him.
In case he ever needed to return to the Sect, Dark Crow erected the monolith in front of the Heavenguard Sect and sealed the Golden Crown inside of it. This Crown served as his symbol, so that, no matter that Era it was, the Heavenguard Sect could recognise him.
There is a monolith erected immediately outside of Heavenguard Sect's entrance. There are no words carved on the monolith, only the image of a crown that seemed as if it belonged to an Immortal Monarch of the nine heavens.