Hooded Horse Wikis
Blightrot
In the end, the Blight came.
Overview
Blightrot is sometimes described as a tax on Rainwater usage. Blightrot generates Blight Cysts and these cysts generate Hearth Corruption with continued Rainwater usage. The more water you use in Rain Engines, the more Blight 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 Blightrot generation you can spare until 3 random Villagers die. You can also hold in the SHIFT key and click on the icon to stop all Engines.
From Veteran to Prestige 10 difficulty, the rate of Corruption generation is 60 Corruption per minute per Blightrot Cyst. It multiplies by 1.5x starting from Prestige 11.
Blight Post, Blightfighters and Purging Fire
On the left is a Blightpost, an essential Building used to produce 
Purging Fire which Blightfighters (Villagers assigned to the Blightpost) then use to burn off Blight 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. 
Purging Fire is made by using 
Coal , 
Sea Marrow, 
Oil or 
Wood.
A single Blightpost can handle a maximum of approximately 20-25 Blightrot Cysts per Storm Season on Veteran to Prestige 10 difficulty (this number goes down to around 15 at Prestige 11 and above). Beyond this point, multiple Blightposts will be needed. A Blightfighter will burn a Cysts for approximately 15 seconds before it disappears. Every Cyst removed lowers Corruption by 50 points.
Blight Post Upgrades
Blight Posts can be upgraded up to two times:
LEVEL I (Choose 1)
Cost:
2 
Pack of Building Materials + 4 
Pipes
- Triple Ignition System: Blight Fighters and Blight Automatons in this Blight Post need 5 fewer seconds to burn a Blightrot Cyst.
- Alchemical Forge: +50% Purging Fire 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 Purging Fire and don't take up worker slots.
LEVEL II (Choose 1)
Cost:
2 Pack of Building Materials + 6 Pipes
- Manned Lookout: the use of water in Rain Engines generates Blightrot Cysts 10% slower for every worker assigned to this Blight Post.
- Mobile Sparkcasters: Blight Fighters 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 Purging Fire and don't take up worker slots.
The Hydrant
The exact number of cysts a Blightpost can handle varies depending on the movement speed and Global Work Speed of your Blight Fighters, and also by cyst location – the less time your Blight Fighters 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 Blightpost and the infested buildings is too great.
Harpies in a Blightpost have a +10% chance to double their Purging Fire production, and 
Lizards in a Blightpost get +5 to their Resolve.
Blightrot Cysts and Removal
Blightfighters (Villagers assigned to Blight Posts) will burn Blightrot Cysts with Purging Fire produced in Blight Posts. This will remove Corruption.
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 and able to be burned off with Purging Fire by Blightfighters.
Difficulty Modifiers influencing Blightrot
| Difficulty Modifier | Description | Explanation |
|---|---|---|
 Prestige 3 |
Large swathes of Blightrot migrates accross the realm. | Every third Clearance Season, 5* Blightrot Cysts will spawn. |
 Prestige 11 |
The Blightrot's impact is stronger. | Blightrot Cyst generation rate is now increased by 100%, the Hearth Corrupts +50% quicker than normal and all effects that spawn Blightrot now add twice as many Cysts. |
*before Prestige 11.
Forest Mysteries and Blightrot
| Forest Mystery | Description | Explanation |
|---|---|---|
 Natural Filtration |
Using Rain Engines causes a lot less Blightrot contamination due to the natural filtration processes of the surrounding vegetation. | Blightrot Cysts grow 50% slower when using Rain Engines. |
 Rotten Vapors |
Machinery has to be cleaned with specially prepared  Drizzle Water. Otherwise, Blightrot will spread.
|
Once this effect activates, you have to pay 5 Drizzle Water (multiplied by the number of years). If you don't, 3* Blightrot Cysts will spawn in your settlement.
|
 Spreading Contamination |
Blightrot contaminates everything you send to the Citadel. | During the storm, the Queen's Impatience grows 5% faster for every Blightrot Cyst in your settlement. |
 Blightrot Infection |
Villagers report feeling sick, especially during the storm. | When a villager leaves or dies, 2* Blightrot Cysts will appear in the settlement. |
 Absorption |
Blightrot Cysts consume the storm's energy and become more resilient. | Burning cysts takes 5 seconds longer. |
 Blight from the Sky |
Blightrot seems to grow uncontrollably quickly in this region. | Every Storm Season, 1* Blightrot Cyst appears in the settlement (multiplied by the number of years that have passed). |
*before Prestige 11.
Glade Events and Blightrot
| Effect | Event | Type | Explanation |
|---|---|---|---|
 Engine Corrosion |
Blightrot Cauldron | Event Consequence | Contaminated liquid gets inside Rain Engines through underground pipes. Using water in Rain Engines generates Blightrot Cysts 50% quicker. |
 Growth Medium |
Rainpunk Cauldron | Working Effect | The Blightrot inside the Rainpunk Cauldron feeds on everything it encounters. For every 20 food produced, 2* Blightrot Cysts are spawned in the settlement. |
 Voice of the Forest |
Withered Tree | Working Effect | Trees communicate with each other through their roots, making the forest aware of your every move. Spawns 1* Blightrot Cysts every 120 seconds for every 2 Dangerous or Forbidden Glades discovered. |
 Effective Parasite
|
Withered Tree | Event Consequence | The Blightrot feeds on the tree's valuable nutrients, making new cysts much more resilient. Cysts burn for 5 seconds longer. |
 Friend or Foe |
Corrupted Caravan | Working Effect | The forest is merciless to those who exploit it. To protect itself, it may even sometimes ally with the Blightrot. Every 120 seconds, 1* Blightrot Cysts are spawned for each earned Hostility level. |
 Straight to the Hearth |
Corrupted Caravan | Event Consequence | Your settlement's strongest and weakest point has become a direct target for the Blightrot. Corruption in the Ancient Hearth grows 50% quicker. |
 Blight Incantation |
Altar of Decay | Working Effect | A powerful, necrotic curse. Burning Blightrot Cysts takes 10 more seconds. Hostility is increased by 45** points for every  Wildfire Essence stored in the settlement's Warehouse.
|
 The Night's Embrace |
Altar of Decay | Event Consequence | The settlement is slowly engulfed in darkness. Each Blightrot Cyst increases Hostility by 15** points during the storm. |
| Awakening | Infected Drainage Mole | Working Effect | Upon awakening the Infected Mole, all dormant Cysts activate and start to Corrupt the Ancient Hearth. Cysts are vulnerable to Purging Fire when this effect is activated. Completing or canceling the Event will not stop the Corruption, and Cysts will remain active until burned.
|
 Infestation |
Infected Drainage Mole | Working Effect | Blightrot becomes extremely aggressive. 8* Blightrot Cysts will spawn in the settlement. Each cyst increases Hostility by 30** points. |
 Overflow |
Noxious Machinery | Working Effect | The machine is somehow connected with the settlement's underground pipe system. You lose 4 units of a random type of Rainwater every 12 seconds. Every 120 seconds, 2* Blightrot Cysts are spawned in the settlement. |
 Blightrot Outbreak
|
Noxious Machinery | Event Consequence | The explosion of the machine will not only destroy everything within a 10** field radius, but will also cause 5* Blightrot Cysts to spawn in the settlement. |
*before Prestige 11.
**value on Viceroy Difficulty and higher.
Cornerstones and Blightrot
| Effect | Source | Description | Explanation |
|---|---|---|---|
 Baptism of Fire |
Cornerstone Legendary |
— | Every 3 burnt Blightrot Cysts lowers Hostility by ‑10. While the Hearth is corrupted, you’re unable to Sacrifice resources. |
 Blight Filter |
Cornerstone Legendary |
A crystalline filter designed to mitigate the negative environmental impact of infused rainwater.. | Blightrot Cysts appear 50% slower when using Rain Engines, but Reputation from Resolve is generated 90% slower for the next 2 Reputation Points. |
| File:Gr 04.PNG Blightrot Pruner |
Cornerstone Legendary |
Blightrot spores aren't technically eggs, but they taste the same. | You gain 5  Eggs when a Blightrot Cyst appears in your settlement.
|
 Burnt to a Crisp |
Cornerstone Legendary |
— | Gain 20 Coal for every 3 burned Blightrot Cysts.
|
| File:SpellBookPage09 98.PNG Overexploitation |
Cornerstone Legendary |
— | Global gathering speed is increased by 30%, and newly discovered resource nodes have more charges (+10 charges to small deposits, +25 charges to large deposits). Every depleted resource node spawns 1* Blightrot Cyst. |
 Firekeeper's Armor |
Cornerstone Epic |
Allows firekeepers to combat Corruption more efficiently. | Every burned Cyst removes an additional 50 Corruption. |
*before Prestige 11.
**value on Viceroy Difficulty and higher.
Plagues and Blightrot
| Plague | Description | Explanation |
|---|---|---|
 Plague of Corrupted Water |
The Rainwater has become contaminated, so Rainpunk machinery is now even more hazardous. | Using Rainwater in Rain Engines generates Blightrot cysts 100% quicker. |
References
Thanks to Discord users Jhazrun, Aphant and Benedict for supplying much needed information to complete this page!
