Solution: Harry Potter
Answer: RIDDLE

Written by Ethan

Each line hints to a spell from Harry Potter. Use the corresponding number in each line to index into the spell name to get VOLDEMORT'S LAST NAME, which is RIDDLE.

SpellIndexExtracted Letter
WINGARDIUMLEVIOSA13V
ALOHOMORA3O
SILENCIO3L
DIFFINDO1D
EPISKEY1E
EXPELLIARMUS10M
PRIORIINCANTATEM4O
ENGORGIO5R
TARANTALLEGRA1T
LUMOS5S
OBLIVIATE3L
PETRIFICUSTOTALUS14A
STUPEFY1S
RICTUSEMPRA4T
INCENDIO5N
AGUAMENTI1A
EXPECTOPATRONUM15M
GEMINIO2E