Purple Heart 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
Purple Heart is a rank 3 Magic Craft recipe with a best success rate of 95% at rank 1 and dan ranks.
Materials
Each craft uses
1× Sasquatch Heart — only from Poisoned Sasquatch (District 2, 40k HP). Not a guaranteed drop