The First Descendant

Lethal Infection Module

Beginner's Guide and Advanced Tips and Tricks
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Season 1 | New Update
★ New Characters: Hailey and Ultimate Freyna
☆ Season Guides: Battle Pass | Invasion Guide | ETA-0
☆ New Void Interception: Death Stalker
☆ New Weapon: Frost Watcher

Lethal Infection is a Descendant module in The First Descendant. Read on to learn how to get Lethal Infection, its effects, and more!

How to Get Lethal Infection

Fortress (Hard) - Heart of the Fortress Mission Monster
Fortress (Hard) - Quarantine Zone Mission Monster
Fortress (Hard) - Ship Charging Facility Complete
Fortress (Normal) - Central Control Unit Mission Monster
Fortress (Normal) - Command Relay Mission Monster
Fortress (Normal) - Defense Line: Vulgus Strategic Outpost Mission Monster
Fortress (Normal) - Destroyed Base Mission Monster
Fortress (Normal) - Explosive Debris Mission Monster
Fortress (Normal) - Fortress Command Entrance Mission Monster
Fortress (Normal) - Frozen Shipyard Mission Monster
Fortress (Normal) - Gate System Control Network Mission Monster
Fortress (Normal) - Giant Hangar Mission Monster
Fortress (Normal) - Heart of the Fortress Mission Monster
Fortress (Normal) - High-thermal Source Detected Zone Mission Monster
Fortress (Normal) - Munitions Loading Dock Mission Monster
Fortress (Normal) - Outlying Communications Facility Mission Monster
Fortress (Normal) - Quarantine Zone Mission Monster
Fortress (Normal) - Ship Charging Facility Complete
Fortress (Normal) - Ship Charging Facility Mission Monster
Fortress (Normal) - Snowy Heights Mission Monster
Fortress (Normal) - Void Fusion Reactor - Fortress Fallen Ark Mission Monster
Fortress (Normal) - Void Fusion Reactor - Fortress Frozen Valley Mission Monster
Intercept Battle: (Hard) Obstructer
Vespers (Hard) - Sepulcher Mission Monster
Vespers (Hard) - The Shelter Mission Monster
Vespers (Hard) - Void Fragment Complete
Vespers (Normal) - Abandoned Village Mission Monster
Vespers (Normal) - Ancient Giant Tree Mission Monster
Vespers (Normal) - Captured Base Mission Monster
Vespers (Normal) - Collapsed Piers Mission Monster
Vespers (Normal) - Destroyed Temple Mission Monster
Vespers (Normal) - Floodplain Mission Monster
Vespers (Normal) - Frontline Base Mission Monster
Vespers (Normal) - Lakeside Mission Monster
Vespers (Normal) - Lost Supply Depot: Vulgus Strategic Outpost Mission Monster
Vespers (Normal) - Lumber Yard: Vulgus Strategic Outpost Mission Monster
Vespers (Normal) - Moonlight Lake: Vulgus Strategic Outpost Mission Monster
Vespers (Normal) - Mossy Colossus Mission Monster
Vespers (Normal) - Old Surveillance Station Mission Monster
Vespers (Normal) - Organic Recording Terminal Mission Monster
Vespers (Normal) - Ruins Courtyard Mission Monster
Vespers (Normal) - Ruins Underground Entrance Mission Monster
Vespers (Normal) - Sepulcher Mission Monster
Vespers (Normal) - Supply Depot Mission Monster
Vespers (Normal) - The Shelter Mission Monster
Vespers (Normal) - Timberfall Power Facility Mission Monster
Vespers (Normal) - Void Fragment Complete
Vespers (Normal) - Void Fusion Reactor - Vespers Moonlight Lake Mission Monster
Vespers (Normal) - Void Fusion Reactor - Vespers Ruins Mission Monster
Legend
Mission Monster - Any of the enemies encountered in the mission can drop the module.
Complete - The module can be received after completing the mission.
Amorphous Material Pattern: XXX Required - Choose the Amorphous Material Pattern after defeating the Colossi in an Intercept Battle.
Descendant Required - Open the Encrypted Vault using the required descendant.
Intercept Battle - Defeat the indicated Void Intercept Boss.

Lethal Infection Basic Info & Effects

Lethal Infection Basic Info
The First Descendant - Lethal Infection.png Lethal Infection Capacity 6
Socket Xantic
Class
The First Descendant - Descendant Icon.png Descendant
Effects
When landing a Firearm Critical Hit on an enemy inflicted with a debuff, Skill Power Modifier +X% for Xs (up to X stacks).

Details Per Level

Lvl Effect Capacity Kuiper Shard Gold
0 When landing a Firearm Critical Hit on an enemy inflicted with a debuff, Skill Power Modifier +1% for 5s (up to 10 stacks). 6 - -
We are still collecting the enhanced effects of this module and others.
Thank you for your patience.

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