Pure Fused Shyllien is crafted with Magic Craft in Mabinogi. This page lists everything needed to make it, checked against the game as it exists today. The interactive planner lives in the Magic Craft Companion.
Recipe availability
Pure Fused Shyllien is a rank Dan 3 Magic Craft recipe with a best success rate of 98% at rank 1 and dan ranks.
Materials
Each craft uses
10× Pure Magic Crystal — Trade Bri Leith Obols for it at Leannan's shop in Murias.
5× Pure Strength Crystal
1× Enchanted Melding Agent — Buy from Leannan's shop in Bri Leith for 500,000 gold.