Caligo Ossuary Mission Walkthrough and Rewards

Caligo Ossuary is a mission in The First Descendant. Read on for a full walkthrough of Caligo Ossuary, its location, rewards, and how to beat Sigvore the Blast Hunter.

Caligo Ossuary Location

Agna Desert

Agna Desert (The Mining Site)

Caligo Ossuary Walkthrough

Caligo Ossuary Objectives

Go Past the Rotating Laser Beams

As soon as you enter the Caligo Ossuary and clearing out some surveillance zones, you will encounter three sets of rotating laser walls. Once the lasers rotate away from the path, use your grappling hook on the rock above to quickly glide towards the other side safely.

Defeat the Elite Vulgus War-Slave

In the area following the laser beams, there will be a locked blast door that you'll have to open by killing the Elite Vulgus War-Slave guarding it. The War-Slave will only appear once you defeat all the other enemies guarding the blast door.

Activate the Decryption Protocol

Guide will instruct you to activate the Decryption Protocol by destroying three Vulgus Technology Devices around the complex.

After damaging a device down to half of its health, it will become immune to damage. You will have to defeat all enemies that have spawned in the area to remove its immunity.

Defeat Sigvore the Blast Hunter

Sigvore the Blast Hunter is the final boss that you will have to beat in the Caligo Ossuary. Fighting him is a bit tricky as he'll deploy several poison bombs and barrels around the area. The best way to defeat him is to always be on the move since he usually throws and detonate his poison bombs on where you're standing at.

How to Beat Sigvore the Blast Hunter

View the Ancestors' Data

Once Sigvore is defeated, interact with the terminal to view the Ancestors' Data and complete the mission.

How to Beat Sigvore the Blast Hunter in Caligo Ossuary

How to Beat Sigvore the Blast Hunter
Avoid Stepping on the Poison Cancel Out His Invulnerability

Avoid Stepping on the Poison

Sigvore has the ability to deploy multiple poisonous barrels. Due to the heat of the battle, you might accidentally shoot these, causing the poison to leak out on the floor. When this happens, avoid stepping on it as your shield will instantly be reduced to zero.

Destroy the Spheres to Cancel Out His Invulnerability

Like most bosses, Sigvore can summon spheres which grant him invulnerability. You can destroy these to cancel it out, however there's a catch. These spheres can become immune to damage after a while, so you can't just destroy them easily. You'll have to wait it out before the spheres become vulnerable again before you can shoot them.

Caligo Ossuary 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