Iron Heart Bow

Obtained from

 * Golden Thiefbug - Culvert (Hard)
 * Red Scar - Wolves Caves (Hard)
 * Penomena - Izrud Cave (Hard)
 * Leviathan - Temple of Sea God (Hard)
 * MoonLight Flower - Secret Forest Tomb (Hard)
 * Kiel MK-Ⅱ - Abandoned Laboratory (Hard)
 * Ungoliant - Hell of Deadly Poison (Hard)
 * Drake - Cursed Ghost Ship (Hard)
 * Juliana Russil - Fortress of Sandstorm (Hard)
 * Executer Meister - Fortress of Sandarman (Hard)