A Necromancer has the ability to extract a soul from a human body and put it in a sword. These are known as Soulswords. Unlike a 100-Year Blade, which has its own soul, a Soulsword's soul always originated from a mortal host.

Soulsword appearances:

Mar 15 2018 XI - Soulswords
Sep 15 2018 XCIX - Swords and Souls