Defeat the High City Boss.
Get your first mercenary Insignia.
Access the High City Subway.
Arrive in the desert to the east of the city.
Activate the antenna in the center of the slums.
Defeat the army and find the laboratory elevator.
Be able to win the event: Void Rift Level 01
Be able to win the event: Void Rift Level 02
Be able to win the event: Void Rift Level 03
Be able to win the event: Void Rift Level 05
Be able to win the event: Void Rift Level 07
Win all Void Rift challenges.
Find all the treasures in the city.
Find all the treasures in the Desert.