This is not a Merit; it is a background per Secrets of Blood Magic. No lore may be learned from your Library above the level of the Library itself. Storyteller discretion applies in all cases as to what specific Lores are available in the Library.
These Libraries contain Lore based information and Blood Magic information appropriate to the Library’s topic. The Library grants 1 bonus trait to any/all investigation attempts on topics appropriate to the Library. The Library also plays an important role in a Character’s progression in Blood Magic (if any is possessed) allowing for enhanced study (i.e. The Staff will make specific mention of the Character’s possession of an Occult Library to appropriate Sub/Coords when the Character is seeking advancement in Blood Magics).