in this book, dumbledore explain to harry why voldermolt is immortal.. it’s because of something call “Horcruxes”. Dumbledore show harry a memory that the young voldermolt (Tom Riddle) was interested in this thing call Horcruxes and ask his potion teacher for more information about this. so the teacher who are no idea that this student is going to be the dangerous wizard ever had told him that, horcruxes is a very dark magic, very dark indeed, that make by a wizard who wish become immortal. the concept is, split out part of your soul and hide it in some object. when that person’s body is kill, that person soul can’t die yet because there’s still part of his/her soul remain out there undamage. he also explain how to make one:
1. get a item that you think is save and suitable (in this case voldermolt choose historical things like trophy).
2. to make one you must have done evil, murder.. the damage on others people make advantages to the person who want to create a horcruxes.
voldermolt also asked that if he make 7 horcruxes will be more powerful cause in magical world 7 is the most powerful number. but the teacher told him that nobody had tried before to make a horcruxes more than 1.
from this event, dumbledore make a conclusion that, Tom Riddle (young voldermolt) had made 7 horcruxes. he suspect one of the horcruxes was already destroy by harry in the 2nd book. the diary, tom riddle diary that open the chamber of secret. dumbledore told harry that he is also successfully destroy 1 horcruxes which is a ring.
at the end, draco malfoy, who’s turning in to death eater (voldermolt’s servents) too help the others death eater to get into hogwart school. to kill dumbledore, which is a very good timing cause at that time, dumbledore is weak (more detail about why he is weak pls ask me). then severus snape turn up and join the death eater. dumbledore trust snape for some reason, but he betray him. for a long time snape has been remain as voldermolt loyal servents and spy on dumbledore. he killed dumbledore~~~ (oh my god.. harry potter’s series without dumbledore, hardly imagine)
because of the death eater successfully enter to hogwart ground, hogwart is no longer save, not without dumbledore. so, after this evident happens, the school is going to be close down. in the next book, there’s no more hogwart school. harry is planning to continue track down the remain horcruxes and destroy it to make voldermolt mortal again so that he can be kill. in the next book, ron and hermione are going to travel with harry to find the horcruxes together. so let’s us wait patiently before the 7th and the last book of harry potter release~~~~~