Defeat the Mischievous Jacks that appear from 10:00 PM to 07:00 AM (in-game time).

*Mischievous Jack will appear at certain nodes, including farms (Bartali Farm, Loggia Farm, Finto Farm, Alejandro Farm, Moretti Plantation, Northern Wheat Plantation, Gianin Farm, Hexe Sanctuary, Soldier's Grave, Kasula Farm, Erdal Farm, Valencia Plantation, Fohalam Farm).