Blightrot

In the end, the Blight came.



Overview
Blightrot is sometimes described as a tax on Rainwater usage. Blightrot generates Blightrot Cysts and these Cysts generate Corruption with continued Rainwater usage. The more water you use in Rain Engines, the more Blightrot Cysts and Corruption you generate.

You can view your Hearth Corruption percentage on the bottom right of your screen. Clicking on the Icon will take you to the Hearth Corruption information page, where you can view how many Blightrot Cysts have generated as well as how much Corruption you can spare until 3 random villagers die. You can also hold the SHIFT key and click on the icon to stop all Engines.

Blight Post, Blightfighters and Purging Fire
On the left is a Blight Post, an essential building used to produce which Blightfighters (villagers assigned to the Blight Post) then use to burn  Blightrot Cysts during the Storm Season. Viceroys can also build a Hydrant to store extra Purging Fire near buildings that have grown a lot of Cysts. is made by using, ,  or.

A single Blight Post without upgrades can handle a maximum of approximately 20-25 Blightrot Cysts per Storm Season on Veteran to Prestige 10 Difficulties (this number goes down to around 15 at Prestige 11 and above). Beyond this point, Blight Post upgrades or additional Blight Posts will be needed.

Blight Post Upgrades
Blight Posts can be upgraded up to two times:

LEVEL I (Choose 1) Cost: 2 + 4 LEVEL II (Choose 1) Cost: 2 + 6
 * Triple Ignition System: Blightfighters and Blight Automatons in this Blight Post need 5 fewer seconds to burn a Blightrot Cyst.
 * Mobile Sparkcasters: Blightfighters assigned to this Blight Post move 30% faster.
 * Blight Automaton: assigns a Blight Automaton that helps burn Blightrot Cysts to this Blight Post. They can't produce and don't take up worker slots.
 * Manned Lookout: the use of water in Rain Engines generates Blightrot Cysts 10% slower for every worker assigned to this Blight Post.
 * Alchemical Forge: +50% double production chance in this Blight Post.
 * Blight Automaton: assigns a Blight Automaton that helps burn Blightrot Cysts to this Blight Post. They can't produce and don't take up worker slots.

The Hydrant
The exact number of Cysts a Blight Post can handle varies depending on the movement speed of your Blightfighters, and also by Cyst location – the less time your Blightfighters spend walking between the Blight Post and the Cysts, the more Cysts they will be able to burn. A well-placed Hydrant will greatly reduce this travel time, and may be essential if the distance between your Blight Post and the infested buildings is too great.

When assigned to a Blight Post, have a +10% chance to double their  production, and  get +5 to their Resolve.

Blightrot Cysts and Removal
During the Storm, Blightfighters can burn Blightrot Cysts with produced in Blight Posts. Each Cyst burned removes 50 Corruption. A Blightfighter will burn a Cyst for approximately 15 seconds before it disappears.



On the left is a closed Blightrot Cyst, Cysts will remain closed during Drizzle Season and Clearance Season, and they are invulnerable during this time. On the right is an open Blightrot Cyst, Cysts will open during the Storm Season, and they are now vulnerable to. Any Cysts left close immediately as soon as the year ticks over and Drizzle Season starts, even if they were in the process of being burned.

Corruption


Blightrot infects Hearths. The more Blightrot Cysts a Viceroy generates from Rain Engine use or Glade Events, the faster their Hearths get corrupted during Storm Season, when Blightrot Cysts open up. Once the Ancient Hearth reaches the Corruption limit, it triggers Voice of the Sealed Ones. Voice of the Sealed Ones sends out 3 ghosts from the Ancient Hearth that seek out and kill 3 random villagers. As soon as the [earth discharges, Corruption is reset to 0 and starts rising again.

Lowering Corruption
The only reliable way to lower Corruption during Storm is to employ the help of Blightfighters in a Blight Post. Every Cyst burned lowers Corruption by 50. Once all Cysts have been burned, any new ones will not open up till next Storm Season. Any Cysts left close immediately and Corruption resets to 0 as soon as the year ticks over and Drizzle Season starts.

You could also remove Cysts by destroying all of the buildings that have Cyst slots. Most buildings you construct have them. With only the Main Warehouse left, you will have no more than 6 Blightrot Cyst slots.

Corruption Resistance and Corruption rate
Corruption Resistance or Hearth Resistance is a measure of how high the Corruption limit is. The higher the Corruption Resistance, the more time it will take for Voice of the Sealed Ones to activate. An Ancient Hearth that hasn't been upgraded has 1000 Corruption Resistance. Every Ancient and Small Hearth level raises Corruption Resistance by 150. It can also be raised with different effects.

The Corruption rate per Cyst is 60 Corruption/minute up to Prestige 10, and 90 Corruption/minute from Prestige 11 onwards.

Assuming a Hearth upgraded to level 2, you will reach the Corruption limit of 1300 at least once without burning any Cysts:
 * At 60 Corruption/minute in a 2-minute Storm with 11 Cysts.
 * At 60 Corruption/minute in a 4-minute Storm with 6 Cysts.
 * At 90 Corruption/minute in a 4-minute Storm with 4 Cysts.

Difficulty Modifiers influencing Blightrot
* before Prestige 11.

Forest Mysteries and Blightrot
* before Prestige 11.

Glade Events and Blightrot
* before Prestige 11. ** value on Viceroy Difficulty and higher.