Currency and crafting materials
Simulacrum Splinters and wave rewards
Simulacrum Splinters provide access to a Delirium boss challenge through the Realmgate.
Delirium mirrors and reward bars in Atlas maps; spend Simulacrum Splinters at the Realmgate.
Repeat Delirium maps until you reach an entry cost. Splinter yield varies, and each new arena attempt requires another listed cost.
Stop farming once you have enough Splinters for a tier you can attempt. Return to maps if you want another entry stack or need to improve your character.
Open a guide to find other locations and see what the item is used for.
Simulacrum Splinters provide access to a Delirium boss challenge through the Realmgate.