[demon of darkness]

Originally Posted by sorabrawl

Do we know how Ansem the Wise created the heartless?

if i remember correctly ansem the wise first experimented with xehanort's heart however xehanort did not turn into a heartless. but later ansem experimented with others hearts and he caused the darkness to consume his experiments hearts, thus creating the first heartless. however afterwards he cease his experiments fearing the chaos the heartless would bring. but xehanort and the other appreninces continued the experiments in secret and during this time they lost their hearts.