Phantasmal Ingot is crafted with Hillwen Engineering in Mabinogi. This page lists everything needed to make it, checked against the game as it exists today. The interactive planner lives in the Hillwen Companion.
Recipe availability
Phantasmal Ingot is a rank 3 Hillwen Engineering recipe with a best success rate of 96% at rank 1 and dan ranks.
Materials
Each craft uses
1× Iron Ingot — refine from Iron Ore (common low-rank Refining output)
1× Copper Ingot — refine from copper ore
1× Silver Ingot — refine from silver ore. Mine it in Barri Dungeon or north of Tory Ravine
1× Gold Ingot — refine from 5 Gold Ore
1× Mythril Ingot — refine from mythril ore. Barri Mythril Mine/Advanced, or L-Rod ore deposits