Looking to make your base unique? Fill it with plague hearts! By filling your base with plague hearts you will also make more zombies spawn. 
 
Drop a bullet or backpack wherever you would like plague hearts and I will instantly change them into plague hearts. 
 
Pick how much health you want the plague hearts to have, from standard to unkillable. 
 
Note: This needs to be installed on your account manually, I will need your account information.