diff --git a/data/json/itemgroups/artifacts.json b/data/json/itemgroups/artifacts.json
index 4c618cb0d607b..2ea578014ffbe 100644
--- a/data/json/itemgroups/artifacts.json
+++ b/data/json/itemgroups/artifacts.json
@@ -10,7 +10,15 @@
           "procgen_id": "twisted_geometry",
           "rules": { "power_level": 750, "max_attributes": 4, "max_negative_power": -1000, "resonant": true }
         },
-        "prob": 100
+        "prob": 50
+      },
+      {
+        "group": "ps_artifacts",
+        "artifact": {
+          "procgen_id": "netherum_tunnels",
+          "rules": { "power_level": 750, "max_attributes": 4, "max_negative_power": -1000, "resonant": true }
+        },
+        "prob": 50
       }
     ]
   },