Deus Vult is the expansion pack for Crusader Kings, a strategy game based on the EU engine and set in the Middle Ages.

Changes and additions for Deus Vult include:
- While the original game had no ledger, as opposed to all other EU games, the expansion features one, which also includes a much-wanted page to review all potential brides for your ruler.

- Characters can now gain friends and rivals in the course of their lives. Friends are more likely to help a character, while rivals will actively conspire against him/her. Waging war between rivals is also more likely, as claiming a rival's title costs less Prestige.

- Characters can also send sons and daughters to another court as fosterlings. While this means a parent will lose control of his/her education, it improves relations between both courts.

- Children, at birth, have now a value of 0 in all stats, and these develop as the child grows up. Links between parent stats and children stats are thus removed. This means also that the culture of the child will be taken from the home province of the parents, not from the parent's culture itself.

- Realm-wide, the expansion adds the concept of Relations between courts, similar to other EU games. Stability is the other addition, although it doesn't work like in EU2. Instead, it is modified through events and can influence other events as well.

- In the original game, Loyalty was an affair between vassal and liege. In Deus Vult, however, courtiers also feature loyalty to their ruler. Low loyalty courtiers are likely to move court or work against their ruler if they are in charge of a court position.

- Graphics have been reworked and added to make Deus Vult more visually appealing than the original game. Deus Vult has been given also minor overhauls to the interface, such as "back" buttons to some windows.

- When negotiating peace, is now possible to force the vassalization of the enemy or to pledge allegiance to the victor.

Other changes to the original game include: the possibility to remove very old claims from a ruler's list, much increased attrition when marching through neutral provinces while at war, tweaks to the combat and siege rules, possibility for revolting provinces to declare independence and give counts and dukes more freedom when deciding to whom pledge allegiance.

The event scripting engine has been also greatly expanded, being the most relevant feature the possibility to save a target character for use later in the event or in a following event. However, historical events or flag markers as in EU2 were not added.

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