Blight Post
The Blight Post is the primary building for your defense against Blightrot for your settlement.
Overview
At the Blight Post, your workers make Purging Fire from fuel-type resources. During the Storm, workers at the Blight Post take Purging Fire from the Blight Post to burn Blight Cysts across the settlement. Those workers must either return to the Blight Post between burning Blight Cysts or to Hydrants to get another Purging Fire.
Note: Unlike with other resources, Blight Post workers do not pick up Purging Fire from the Warehouse when fighting Corruption. They get it from Blight Posts or Hydrants.
Strategies
Depending on the extent of Blightrot in your settlement, you may need the Blight Post right in the center of your industrial area. Your workers will need to go back and forth often to the Blight Post during the Storm, and you may need to minimize their walking distance.