[Aftershock] Millyficent whately and the migo (#36908)

data/mods/Aftershock/effects.json

@@ -0,0 +1,58 @@
+[
+  {
+    "id": "fd_migo_atmosphere",
+    "type": "field_type",
+    "intensity_levels": [
+      {
+        "name": "foul-smelling air",
+        "sym": "8",
+        "dangerous": true,
+        "effects": [
+          {
+            "effect_id": "migo_atmosphere",
+            "body_part": "MOUTH",
+            "intensity": 1,
+            "min_duration": "5 seconds",
+            "max_duration": "10 seconds",
+            "immune_inside_vehicle": true
+          }
+        ]
+      },
+      {
+        "name": "foul-smelling air",
+        "translucency": 1,
+        "effects": [
+          {
+            "effect_id": "migo_atmosphere",
+            "body_part": "MOUTH",
+            "intensity": 2,
+            "min_duration": "10 seconds",
+            "max_duration": "25 seconds"
+          }
+        ]
+      },
+      {
+        "name": "foul-smelling air",
+        "effects": [
+          {
+            "effect_id": "migo_atmosphere",
+            "body_part": "MOUTH",
+            "intensity": 4,
+            "min_duration": "15 seconds",
+            "max_duration": "25 seconds"
+          }
+        ]
+      }
+    ],
+    "decay_amount_factor": 5,
+    "gas_absorption_factor": 15,
+    "percent_spread": 30,
+    "outdoor_age_speedup": "3 minutes",
+    "dirty_transparency_cache": true,
+    "has_fume": true,
+    "immunity_data": { "body_part_env_resistance": [ [ "MOUTH", 15 ] ], "traits": [ "MIGO_BREATHE" ] },
+    "priority": 8,
+    "half_life": "10 minutes",
+    "phase": "gas"
+  }
+]

data/mods/Aftershock/items/mutagen.json

@@ -0,0 +1,22 @@
+[
+  {
+    "id": "iv_mutagen_migo",
+    "copy-from": "iv_mutagen_flavor",
+    "type": "COMESTIBLE",
+    "name": "mi-go serum",
+    "description": "A super-concentrated mutagen strongly resembling a lava lamp.  You need a syringe to inject it… if you really want to?",
+    "price": 1000000,
+    "color": "red",
+    "healthy": -4,
+    "use_action": { "type": "mutagen_iv", "mutation_category": "MIGO" }
+  },
+  {
+    "id": "mutagen_migo",
+    "copy-from": "mutagen_flavor",
+    "type": "COMESTIBLE",
+    "name": "mi-go mutagen",
+    "description": "An extremely rare mutagen cocktail, it smells of sulphur and glows orange.",
+    "price": 500000,
+    "use_action": { "type": "mutagen", "mutation_category": "MIGO" }
+  }
+]