Seeing the names of the abilities that the soul of the Overseer gave to that sword, his curiosity was intrigued.
From the epic rune came 3 abilities, which were [Flames of Eternal Will-Weak], [Watch Over Will], and [Undead Wielder].
[Flames of Eternal Will-Weak]: The will of this soul's master is the will of his master. And that soul swore to follow such will for all eternity even though in his last moments his body burned in flames. Now the strong will of the soul manifested the ability to create the same flames one his last moments to his enemies. The will of his master is eternal just like the flames. Despite the soul wanting to follow his will though, the lack of strength reflects on the flames. Continuous use of mana is required needed for the flames to stay intact, spread, and burn for all eternity.