Each time the players enter a new room roll a d6. If the result is 1, they will encounter either Madora the Mad Abbess or Anaru the Thief.
1-3: Madora (Encounter Here)
4-6: Anaru (Encounter Here)
The Undercroft of the Abbey of St Ursula is an extensive series of underground chambers. These are mostly used to store barrels and bottles of wine at various controlled temperatures as it ages, in addition to housing the other food stores of the abbey. However, one section of the Undercroft are crypts for the former Abbesses, including if legend is to be believed Saint Ursula herself.
In addition, during the The Pirate Crusade various artifacts and books of the Northern Church of Mithras were hidden deep in the undercroft in order to keep them safe.