How can I the get Resistance Plates?

In order to receive the Resistance Plates you need to complete the "Ancient Magic Mysteries 5/11" quest - you need to click on the Haunted House 10 times (the territory with the Haunted House has to be open) and you will get Resistance Plates. Please make sure that you have the said quest, because you won't receive the plates from the Haunted House if the quest is not active.