Slumber Valley is a mission in The First Descendant. Read on for a full walkthrough of Slumber Valley, its location, rewards, and how to beat Greg!

Slumber Valley Location

Kingston

Kingston (Grand Square)

Slumber Valley Walkthrough

Slumber Valley Objectives

Clear Out All the Surveillance Zones

Follow the waypoint that will take you to each of the Surveillance Zones. Once there, defeat all the enemies that are being dropped by the hostile aircraft nearby.

Destroy the Vulgus Technology Devices

Along the way, you will have to destroy Vulgus Technology Devices. Once you've dealt a certain amount of damage to them, their shield barriers will go online. You can shut the shields down by killing all hostiles spawned in the area.

Defeat Greg

Upon reaching the final zone, you'll have to defeat the final boss, Greg, three times. Be aware that throughout the fight, several Vulgus Followers will also join in the battle. There will also be a supply robot hiding safely behind a rock, so make sure to resupply when needed.

How to Beat Greg

How to Beat Greg in Slumber Valley

How to Beat Greg
Avoid Using Explosives Shoot the Three Spheres Run Around to Evade the Laser Beam

Avoid Using Explosives

Refrain from using grenade launchers as they don't seem to damage Greg effectively. Instead, use high fire-rate weapons such as Machine Guns or SMGs, then aim for Greg's head to reduce his HP quickly.

Shoot the Three Spheres

Greg will occasionally summon three spheres around him, which act as a form of protection barrier. Make sure to destroy these first, as you won't be able to deal damage to him while the spheres are floating around him.

Be sure to destroy all three spheres as fast as you can, otherwise they will respawn.

Run Around If You Get Targeted by the Laser Beam

Once Greg targets you with a laser beam, run around as fast as you can to avoid being struck down by flames. These flames will reduce your HP over time, so make sure to avoid the laser-targeting beam.

Slumber Valley Rewards

The First Descendant Related Guides

Main Quest Walkthrough

All Mission Types

Kingston Missions

Sterile Land Missions

Vespers Missions

Echo Swamp Missions

Agna Desert Missions

White-night Gulch Missions

Hagios Missions

Fortress Missions