Asorcerer who manipulates some fingernail clippings they gathered from an intended victim to cause harm to that person is using

Contagious Magic

Explanation:

Contagious magic can be defined as that sort of magic that works on the assumption that anything related to a person or belonging to that person either in present or prior even after being separated from that person can be used to harm the person..

For an instance, anything or any harm caused to the hair, nails or any garment of that person will harm that person.

Thus the sorcerer while manipulating the nail clipping in order to harm the person shows the signs of contagious magic.

the answer is solomon northrup. he was a free-born african american, abolitionist and professional violinist that was drugged, kidnapped and sold as slave in 1841 and remained in captivity until 1853 where he regained his freedom with the of the then-governor of new york, washington hunt. he wrote and published his memoirs "twelve years a slave" in 1853, and in this text, he tells the story of his escape thru one of louisiana's swamps (the great pacoudrie swamp) in which he ended up covered in green slime from crossing the surface of the dead water.

answer; night terrors;