You eat the "core" of the cup and you get so much. Actually eating a soul increases your knowledge of soul magic, but that is nothing compared to the memories you get. You get flashes, opening Chamber of Secrets, creating the dairy, the ring, the locket, and finally the cup by splitting his soul into fragments, hiding them, talking to Lucius and giving him the dairy, and killing, so much killing, even killing your own parents. You do realize something Voldemort didn't though, every time he spilt his soul it made him weaker, more insane. Compared to that, the only thing you got from Binns, is the ability to pass a history test. Although, you now have acess to the cups original abilities (even if you don't know what they are) and the curruption is already starting to fade.-------------------------------------------------------------------------------------------------------------------------
After you finish creating the Cooridors of Darkness, you head to the library and finally read those illusion books you got from beginning to end, which takes quite a while. You learn a lot and realize some of the awesome things you can do with illusion magic. Unfortunately, while you may understand it, you actually have to practice it to be able to do anything above low-level, good for distractions and little more.
[] Where do you go and what do you do?
[Unlocked Locations: Riddle Mannor, Malfoy Mannor, Chamber of Secrets, Gaunt Shack, Crystal Cave]
[Unlocked Skills: Avada Kedavra, Illusion Magic: Low] Illusion magic is easier to raise to high-level, due to only needing to practice.
[Skill Upgraded: Soul Magic: Mid-High]
[Trait Gained: Parsel Tongue]
A.N. Avada Kevda actually works by forcefully sending a soul to "Limbo" before its time. This only works in the Potterverse. (So no instant killing any where else)
Also, the only reason you got the memories is because actually eating a soul raised your level high enough. If you had tried this before, you would only gotten Parsel Tongue (and you won't get as much from other soul fragments)
In addition, all your curent goals are optional, with exception of finding the other Shards of Darkness, so you don't have to worry about them if you don't want to.