Covenant Laboratory is an unusual location in Total War: WARHAMMER III. It can spawn periodic plagues, raises Nurgle corruption locally, and can provide replenishment and reduced spell costs when no plague is active.
Be warned that there is a chance – albeit an extremely small chance – that this Cult can cause a
potentially horrific, and game-ending, scenario through means of Plague.
This unusual location can be disabled in the settings before starting a campaign.
Covenant Laboratory
Most of the substances in this nightmarish slop coexist peacefully in malodorous ebullition, yet others gurgle a maddening, corruptive murmur.
Crimson Fever: 5% chance per turn for a weak plague to infect this region
Crimson Pox: 1% chance per turn for a damaging plague to infect most of your faction
Crimson Plague: 0.01% chance per turn for a devastating plague to infect the entire world
Nurgle corruption: +20
(local region)
When this settlement has no active Plague:
Winds of Magic cost: -20% for all spells
(all region owner armies)
Immune to all non-Plague attrition
(all region owner armies)
Casualty replenishment rate: +10%
(all region owner armies)
Enables replenishment in foreign territory
(all region owner armies)
Crimson Fever: 5% chance per turn for a weak plague to infect this region
Nurgle corruption: +20
(local region)
Plague:
Winds of Magic cost: -20% for all spells
(all region owner armies)
Immune to all non-Plague attrition
(all region owner armies)
Casualty replenishment rate: +10%
(all region owner armies)