Open the Foundry
Select the Arcane item you want to craft
Check the required materials for Violet Shards
Obtain the required resources
Craft the item in the Foundry
Wait for the crafting timer to finish
Claim the crafted item
Equip the Violet Shard in the Helminth Chrysalis menu
Use Archon Shards fusion options if needed
Repeat the process for additional Violet Shards