Dredgen Yor

Dredgen Yor was an infamous Guardian who fell to Darkness and became one of humanity's most hated villains. He was also the former owner of the exotic Hand Cannon Thorn. He started his life as a noble hero, and a champion of the Crucible, but over time he began to despair and started looking to the Hive for ways to defeat the Darkness. Eventually he was overtaken by Darkness completely, and began wielding the dark sorcery of the Hive, killing innocents wantonly and consuming their Light.

It is heavily implied that Yor was responsible for the destruction of the settlement of Palamon and the death of its protector, the Guardian and owner of Last Word, Jaren Ward. He is confirmed for murdering two other guardians, Pahanin Errata and Thalor. Yor would eventually fight against Ward's son, Shin Malphur, in a showdown at Dwindler's Ridge. Shin described Yor as "the darkest shadow [he] would ever know."