With a specific requirement in mind, Amberser knew how to weave this soul.
The mobility of a Death Knight came entirely from their mount, and the summoning of mounts varied, which led Amberser to enhance the soul-related abilities as much as possible. Then there was the requirement for independent and autonomous mission completion, which meant the Undead had to understand how to adapt to circumstances and design the details of their actions accordingly.
Although Undead didn't need to worry about supplies, they still had to consider recovery, so this Death Knight must have a way to heal themselves—maybe a dark healing spell or a similar spell capability. There also needed to be an enhancement of the Death Knight's magic power recovery, which required an affinity between the soul and dark magic power...
Amberser wrote down these directions first, then proceeded with meticulous settings to ensure there would be no mistakes when it came time to weave the soul.
