"It's not that you aren't allowed to go there. It's that you're not allowed to go there without me. But you're welcome to try and go, though. Provided you can hack the security firewall I put on the computer and if you can, by all means jump to the fandom. But when that scary, bus-sized mantis bites off your legs and contemplates having your brain for a snack, don't you come running to me complaining about it."
-Adrian, when asked about the Black-List

The Library Arcanium can connect to anyplace and this includes any world of fanfiction. But fandoms come in all shapes and sizes, ranging from the extraordinary to the mundane and everything in between. And of course, quite a few fandoms lean to the more realistic side of things, where the rules of reality are strictly enforced-meaning getting shot will mostly likely result in your death. Thus, when allowing the Society to use his Library, Adrian sealed off any fandoms he felt were dangerous to his fellow members. This became known as the Black-List and no one is allowed to enter one the fandoms on it without Adrian accompanying them. Though recently, several members manged to break the firewall and enter a Black-listed fandom, with disasterous and near-fatal consequences. As a result, Adrian has tightened security to those worlds greatly and keyed the List to a password only he knows.

The current Black-List is(will be updated as necessary):

Claymore
Bleach
Fate/Stay Night
The Inheritance Cycle
Star Wars
Elfien Lied
Darkness
Darker than Black
Rurouni Kenshin
Code Geass(All Verisons)
Ghost in the Shell
Death Note
Van Hellsing
Witchblade
Zombie Powder
Fullmetal Alchemist
Evangelion
Mahou Sensei Negima
Big O
Akira
Starship Troopers
Battlestar Galactica
Serenity
Godzilla
Dance in the Vampire Bund
Street Fighter
Naruto
Vampire Knight
Barney (Many scratch their head over this one...but Adrian swears he has his reasons for it...)