The Blackthorn is a Light Fae leader from the Old Country.
The Blackthorn appeared at the local Light Fae territory as an emissary. After the attack against The Ash and Light Fae Elders, the clan's governing High Council and The Blackthorn ordered the Stag Hunt, a traditional Light Fae ceremonial hunt to select a new Ash, as punishment against the wounded Ash for the attack happening under his watch. He did not know that Aife was responsible for the attack against his clan.
After Trick assured him that he had no pretention towards power and re-establishing his former status, The Blackthorn agreed to keep Trick's identity secret — but only if there were no efforts made to locate Aife.
"Humans are food. We eat from them or we die. Now the Dark Fae, they tend to kill for pleasure, not just need...We're more like your Native American hunters. We respect the kill. Won't over-hunt. Don't eat the young." – to Bo.