Professor Severus Snape was a half-blood wizard who was the son of the witch Eileen Snape and Tobias Snape. During his lifetime, Severus Snape was Potions Master (1981–1996), Defence Against the Dark Arts professor (1996-1997), and Headmaster (1997-1998) of Hogwarts School of Witchcraft and Wizardry (which he attended as a student from 1971 until 1978). He was also member of the Order of the Phoenix and played a very important role in both of the Wizarding Wars against Lord Voldemort.
Powers and Stats
Tier: 9-B physically, 9-C with Sectumsempra, 9-B with other spells
Name: Severus Snape, The Half-Blood Prince.
Origin: Harry Potter
Age: 38 at the time of his death
Classification: Human, Wizard
Powers and Abilities: Magic, Teleportation, Telepathy, Matter Manipulation, Excellent at making potion, Durability Negation, Paralysis spells, Healing, Resistant to Mind Attacks, Flight, Telekinesis, and Death Manipulation (via Avada Kedavra)
Lifting Strength: Athletic Human by himself. At least Athletic Human with spells (Sent Harry Potter flying backwards effortlessly).
Striking Strength: Wall Class
Stamina: Unknown, likely high
Range: Several dozen meters
Standard Equipment: Wand
Intelligence: Genius (able to infiltrate Voldemort's army, figured out the Marauders' secret).
Weaknesses: Lily and by extension Harry Potter.A little arrogant.Otherwise none notable.
Sectumsempra: A rather dangerous curse, created by Snape himself, when the incantation is uttered its effect is the equivalent of an invisible sword; it is used to slash the victim from a distance, causing rather deep wounds. The slash follows the user's wand movements. Due to the depths of the cut, the victims run the risk of dying from blood loss if treatment is not applied in time, if the wounds are not instantly fatal.
Vulnera Sanentur: A healing spell that can heal someone who is even hit by sectumsempra. For maximum effect of the spell, the incantation had to be repeated thrice; firstly slowing the flow of blood to prevent death by exsanguination; the second to clear residue and begin to heal the wounds; and the third to fully knit the wounds, although dittany had to be applied to prevent scarring.
Avada Kedavra: The Killing Curse is a tool of the Dark Arts and one of the three Unforgivable Curses. It is one of the most powerful and sinister spells known to wizardkind. When cast successfully on a living person or creature, the curse causes instantaneous death.
And many other spells, potions, charms and curses.