diff --git a/packages/isaac-typescript-definitions/src/enums/PickupPrice.ts b/packages/isaac-typescript-definitions/src/enums/PickupPrice.ts
index 7e2b5f134..75eba8a05 100644
--- a/packages/isaac-typescript-definitions/src/enums/PickupPrice.ts
+++ b/packages/isaac-typescript-definitions/src/enums/PickupPrice.ts
@@ -20,6 +20,12 @@ export enum PickupPrice {
   TWO_SOUL_HEARTS = -8,
   ONE_HEART_AND_ONE_SOUL_HEART = -9,
 
+  /**
+   * The official in-game enum does not have this value, but it is the correct value used by game.
+   * It corresponds to the Devil Room mechanic with the `devilsacrifice` collectible tag.
+   */
+  DEVIL_SACRIFICE_SPIKES = -10,
+
   /** The Store Credit trinket causes items in the shop to cost 0 cents. */
   FREE = -1000,
 }
diff --git a/packages/isaacscript-spell/dictionaries/isaac/files.txt b/packages/isaacscript-spell/dictionaries/isaac/files.txt
index 9036d21d7..d1d975d46 100644
--- a/packages/isaacscript-spell/dictionaries/isaac/files.txt
+++ b/packages/isaacscript-spell/dictionaries/isaac/files.txt
@@ -26,6 +26,7 @@ craftquality # items_metadata.xml
 deathanm # items.xml
 devilprice # items.xml
 devilroomdoor # door_07_devilroomdoor.png
+devilsacrifice # items_metadata.xml
 endstage # challenges.xml
 fadecolor # cutscenes.xml
 firedelay # items.xml