After finishing the Entoma Queen fight in Chapter One, you will be able to use the Summon coding ability of Arata's to summon the Entoma Queens of the past. Their presence draws enemies to them, though every time they attack or are attacked, the corruption value of the field increases heavily. They will only survive on the field as long as their health remains or the corruption lies under 100%. Simply clear the field enough to summon with Arata and bring out the one you fell to satisfy this trophy.