Intense Memory Crystal 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
Intense Memory Crystal is a rank 3 Hillwen Engineering recipe with a best success rate of 98% at rank 1 and dan ranks.
Materials
Each craft uses
3× Green Memory Fragment — Trade 25 Bri Leith Obols with Leannan in Murias after clearing Bri Leith gates.
10× Variscite — Trade 3 Bri Leith Obols to Leannan after clearing the Bri Leith raid.
5× Enchanted Melding Agent — Buy from Leannan's shop in Bri Leith for 500,000 gold.
2× Pure Gemstone — Craft it with Magic Craft using Gemstone Powder from fragmenting Ascension Gems.