Old Sheep had long wanted to find a Heavenly Demon as research material. If not for Freedom Heaven quickly clinging to a big shot and having its True Name exposed, would Old Sheep have let go of such a material right under his nose?
Knowing the True Name, apart from killing it directly with the Heavenly Demon True Name Spell, there was no other point, and its research value plummeted.
In Old Sheep's little research booklet, there was research about Heavenly Demons.
He just hadn't found a Heavenly Demon with an uncertain True Name; simply lacking material.
The Heavenly Demon True Name Spell wasn't like this from the beginning; it continuously iterated and evolved to its current form.
For updates and iterations, it surely required a large number of experiments and progress through practice.
The cost, naturally, was that the once active Heavenly Demons in the world became increasingly rare, and now, the Heavenly Demon True Name Spell is shelved.
