Comment by Starryyy on Diddys Dungeon Master.

@Diddys Dungeon Master. it's kind of a power reserve like how in most other manhwa they have sword aura/mana/qi energy/spirit power/divine powers. It's also similar to the martial arts manhwa with their cultivation. He needs a way to unlock his own sword aura and the voice showed him how it's done and he got taste of the endless energy/world the voice has. The voice has returned to the depts of Vlad's world/aura/mana/flow and he will only be able to interact with him again once he learns how to freely use that energy/world