Colossal Valiance Greaves (M) 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
Colossal Valiance Greaves (M) is a rank 7 Hillwen Engineering recipe with a best success rate of 98% at rank 1 and dan ranks.
Materials
Each craft uses
1× Metal Boots — Buy basic metal footwear from any armor shop NPC in town.
10× Hillwen Alloy
5× Valiance Metal Shard — Hard/Elite Shadow Mission reward or Advanced Hard Mode Dungeon reward
3× Ancient Beast Hide — Reward from Hard and Elite shadow missions like Taillteann Defensive Battle.
2× Sub-Zero Coolant — Possible reward from Elite Shadow Missions like All-Out War or Sniper War.