Tataka said it was possible to enhance the Noble Siel's Supreme Polearm. You obtained the Vorpal Essence, Special Shulack Refiner, and Blessed Aurium Ingot as Tataka said, and fused them together at Debilkarim's Forge to create the Essence of Siel. You took the Essence of Siel to Tataka, and he created a Siel's Dominant Polearm.