Official rule text
98.2 Each player uses the victory point track to indicate the number of victory points they have gained. a If the players are using the 14-space side of the victory point track, the game ends and a player wins when they have 14 victory points instead of 10.
View official source
Source: Living Rules Reference and FAQ - Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 98.2