Tower Shield Fragment Tower Shield Fragment NPC Name Level - Type Quantity Chance Drop Dread Avenger Kraven 44 Passive 60-180 3.74% Iron Giant Totem 45 Passive 60-180 8.5% Archon Suscepter 45 Passive 60-180 3.76% Headless Knight 50 Aggressive 1 1 / 249 Purgatory Invader Food 50 Passive 1 1 / 254 Sanhidro 52 Passive 1 1 / 267 Zombie Captain's Spiritual Body 52 Aggressive 1 1.53% Spoil Forest Runner 50 Passive 1 14.2857% Purgatory Invader Soldier 50 Aggressive 1 20%