they <p>they spawn, so you need to kill the spawn in order to make the monster spawn again influenced.
"Influenced influenced.<br><br><em>"Influenced creatures have a low chance of spawning instead of a regular creature. Differently from fiendish ones, influenced creatures will remain influenced until a player kills it or until a Server Save takes place."
Source: https://tibia.fandom.com/wiki/Fiendish_and_Influenced_Creaturesplace."</em><br><br>Source: https://tibia.fandom.com/wiki/Fiendish_and_Influenced_Creatures</p>