Divinity expanded the range of one's existence and a mortal had to come to terms with this.
Being extracted from mortality had many meanings, and one of them was that simply existing as one entity that could be obliterated ceased to be the norm.
Even though Fulgardt had perished long ago, he still existed. His body, through a collection of conditions and powers, was able to move on its own within the Labyrinth of the Yoke, following a desire he had instilled in it, and his consciousness had been terrorising Skullius vivaciously.
Mortal Binding helped with making a mortal familiarise themselves with something like this, which would have been extremely unrelatable for most of their life. Feeling the throbbing of their power from multiple vessels, the surge of it promising an existence beyond the blood and veins that they began the journey of life with, was both thrilling and difficult to grasp for the average individual.