So he used the Death Sword to gather an ungodly amount of souls, not to power up the sword itself but to have enough resources for his clone army.
That's pretty cool.
A bit disappointed that his death sword which was supposed to be the strongest was really just a soul bank. Unless of course it has a secondary function
Do you remember the Iceland Legacy Sword? The one that can awaken past-generations of Norland Heroes (Include Karwen and Roland before their demise).
I wished he were to use it like a soul-usb stick and inject the data into the cloning magic formation.