Official rule text
98.8 If the game ends because the speaker cannot reveal an objective card, the player with the most victory points is the winner. If one or more players are tied for having the most victory points, the tied player who is first in initiative order is the winner. RELATED TOPICS: Agenda Card, Imperial, Objective Cards
View official source
Source: Living Rules Reference and FAQ - Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 98.8