The Archive will be the location for researching new Veins of Evil unlocks. As your researchers focus their efforts over time, their discoveries will aid you in choosing just how you want to play the game. At the same time, the Archives is also a way for researcher types to train and even some units are entertained by simply sitting down and reading a book.
Within the musty tomes preserved within this room's walls lies the knowledge of centuries - passed on from one unholy member of the occult to the next. The Archive will entice Cultists to your cause who will pore over the volumes, increasing the rate at which you progress through the Veins of Evil.
Upgrading your Archive will allow your Cultists to gain experience whilst researching.