The Roach Killer is an Item that can be found within common locations, including choice enemy Camps, given by Spouses, and rarely as a reward from Seasonal Festivals. Upon being picked up, all Roaches close to the player will instantly be killed. Specifically, each one within the newly created 4x4 radius will immediately die. There will be a faint, brown cloud affect to signify the borders of this radius. This can be especially beneficial in higher years, where Roaches can become a major nuisance.
Compared to other means of dealing damage, Roach Killer can be superior to other Items for killing Roaches due to its instant kill effect. However, this perk is also this Item's downfall, due to only affecting one type of Enemy. Because of this, Roach Killer is much more situational compared to other Items and means of dealing damage, and may not be the most valuable because of that.