diff --git a/Asset/data/asset/functions/effect/0124.darkness/_/end.mcfunction b/Asset/data/asset/functions/effect/0124.darkness/_/end.mcfunction
new file mode 100644
index 0000000000..7ee9439e5f
--- /dev/null
+++ b/Asset/data/asset/functions/effect/0124.darkness/_/end.mcfunction
@@ -0,0 +1,7 @@
+#> asset:effect/0124.darkness/_/end
+#
+# Effectの効果の終了時に実行されるfunction
+#
+# @within tag/function asset:effect/end
+
+execute if data storage asset:context {id:124} run function asset:effect/0124.darkness/end/
\ No newline at end of file
diff --git a/Asset/data/asset/functions/effect/0124.darkness/_/register.mcfunction b/Asset/data/asset/functions/effect/0124.darkness/_/register.mcfunction
new file mode 100644
index 0000000000..307bf07f3f
--- /dev/null
+++ b/Asset/data/asset/functions/effect/0124.darkness/_/register.mcfunction
@@ -0,0 +1,7 @@
+#> asset:effect/0124.darkness/_/register
+#
+#
+#
+# @within tag/function asset:effect/register
+
+execute if data storage asset:context {id:124} run function asset:effect/0124.darkness/register
\ No newline at end of file
diff --git a/Asset/data/asset/functions/effect/0124.darkness/_/remove.mcfunction b/Asset/data/asset/functions/effect/0124.darkness/_/remove.mcfunction
new file mode 100644
index 0000000000..afe2948d50
--- /dev/null
+++ b/Asset/data/asset/functions/effect/0124.darkness/_/remove.mcfunction
@@ -0,0 +1,7 @@
+#> asset:effect/0124.darkness/_/remove
+#
+# Effectが神器や牛乳によって削除された時に実行されるfunction
+#
+# @within tag/function asset:effect/remove
+
+execute if data storage asset:context {id:124} run function asset:effect/0124.darkness/remove/
\ No newline at end of file
diff --git a/Asset/data/asset/functions/effect/0124.darkness/_/tick.mcfunction b/Asset/data/asset/functions/effect/0124.darkness/_/tick.mcfunction
new file mode 100644
index 0000000000..44bf6bf46f
--- /dev/null
+++ b/Asset/data/asset/functions/effect/0124.darkness/_/tick.mcfunction
@@ -0,0 +1,7 @@
+#> asset:effect/0124.darkness/_/tick
+#
+# Effectが発動している間毎tick実行されるfunction
+#
+# @within tag/function asset:effect/tick
+
+execute if data storage asset:context {id:124} run function asset:effect/0124.darkness/tick/
\ No newline at end of file
diff --git a/Asset/data/asset/functions/effect/0124.darkness/end/.mcfunction b/Asset/data/asset/functions/effect/0124.darkness/end/.mcfunction
new file mode 100644
index 0000000000..55e1cab823
--- /dev/null
+++ b/Asset/data/asset/functions/effect/0124.darkness/end/.mcfunction
@@ -0,0 +1,8 @@
+#> asset:effect/0124.darkness/end/
+#
+# Effectの効果が切れた時の処理
+#
+# @within function asset:effect/0124.darkness/_/end
+
+# 暗闇を削除
+    effect clear @s darkness
diff --git a/Asset/data/asset/functions/effect/0124.darkness/register.mcfunction b/Asset/data/asset/functions/effect/0124.darkness/register.mcfunction
new file mode 100644
index 0000000000..802cb30321
--- /dev/null
+++ b/Asset/data/asset/functions/effect/0124.darkness/register.mcfunction
@@ -0,0 +1,35 @@
+#> asset:effect/0124.darkness/register
+#
+# Effectのデータを指定
+#
+# @within function asset:effect/0124.darkness/_/register
+
+# ExtendsSafe (boolean) (default = false)
+    # data modify storage asset:effect ExtendsSafe set value true
+# ID (int)
+    data modify storage asset:effect ID set value 124
+# 名前 (TextComponentString)
+    data modify storage asset:effect Name set value '{"text":"暗闇"}'
+# 説明文 (TextComponentString[])
+    data modify storage asset:effect Description set value '{"text":"プレイヤーの視界を暗くする"}'
+# 効果時間 (int) (default = API || error)
+    # data modify storage asset:effect Duration set value 
+# スタック (int) (default = API || 1)
+    # data modify storage asset:effect Stack set value 
+# 効果時間の操作方法 (default = API || "replace")
+    data modify storage asset:effect DurationOperation set value "forceReplace"
+# スタックの操作方法 (default = API || "replace")
+    data modify storage asset:effect StackOperation set value "forceReplace"
+# 最大効果時間 (int) (default = 2147483647)
+    # data modify storage asset:effect MaxDuration set value 
+# 最大スタック (int) (default = 2147483647)
+    data modify storage asset:effect MaxStack set value 1
+# 悪い効果か否か (boolean)
+    data modify storage asset:effect IsBadEffect set value true
+# 死亡時のエフェクトの処理 (default = "remove")
+    # data modify storage asset:effect ProcessOnDied set value 
+# 消すのに必要なレベル (int) (default = 1)
+    data modify storage asset:effect RequireClearLv set value 3
+
+# フィールド
+    # data modify storage asset:effect Field set value {}
diff --git a/Asset/data/asset/functions/effect/0124.darkness/remove/.mcfunction b/Asset/data/asset/functions/effect/0124.darkness/remove/.mcfunction
new file mode 100644
index 0000000000..77593abdf3
--- /dev/null
+++ b/Asset/data/asset/functions/effect/0124.darkness/remove/.mcfunction
@@ -0,0 +1,8 @@
+#> asset:effect/0124.darkness/remove/
+#
+# Effectが削除された時の処理
+#
+# @within function asset:effect/0124.darkness/_/remove
+
+# 暗闇を削除
+    effect clear @s darkness
diff --git a/Asset/data/asset/functions/effect/0124.darkness/tick/.mcfunction b/Asset/data/asset/functions/effect/0124.darkness/tick/.mcfunction
new file mode 100644
index 0000000000..6bc2aaac45
--- /dev/null
+++ b/Asset/data/asset/functions/effect/0124.darkness/tick/.mcfunction
@@ -0,0 +1,8 @@
+#> asset:effect/0124.darkness/tick/
+#
+# Effectのtick処理
+#
+# @within function asset:effect/0124.darkness/_/tick
+
+# 暗闇を付与
+    effect give @s darkness infinite 0 true
diff --git a/Asset/data/asset/tags/functions/effect/end.json b/Asset/data/asset/tags/functions/effect/end.json
index 923e587d0c..5c1f464580 100644
--- a/Asset/data/asset/tags/functions/effect/end.json
+++ b/Asset/data/asset/tags/functions/effect/end.json
@@ -26,6 +26,7 @@
         "asset:effect/0607.sedation/_/end",
         "asset:effect/0608.sinking/_/end",
         "asset:effect/0612.infringement/_/end",
-        "asset:effect/0613.white_curse/_/end"
+        "asset:effect/0613.white_curse/_/end",
+        "asset:effect/0124.darkness/_/end"
     ]
-}
+}
\ No newline at end of file
diff --git a/Asset/data/asset/tags/functions/effect/register.json b/Asset/data/asset/tags/functions/effect/register.json
index df31219d4e..e8b3d37889 100644
--- a/Asset/data/asset/tags/functions/effect/register.json
+++ b/Asset/data/asset/tags/functions/effect/register.json
@@ -30,6 +30,7 @@
         "asset:effect/0607.sedation/_/register",
         "asset:effect/0608.sinking/_/register",
         "asset:effect/0612.infringement/_/register",
-        "asset:effect/0613.white_curse/_/register"
+        "asset:effect/0613.white_curse/_/register",
+        "asset:effect/0124.darkness/_/register"
     ]
-}
+}
\ No newline at end of file
diff --git a/Asset/data/asset/tags/functions/effect/remove.json b/Asset/data/asset/tags/functions/effect/remove.json
index e35ad51372..1c02fa9a3a 100644
--- a/Asset/data/asset/tags/functions/effect/remove.json
+++ b/Asset/data/asset/tags/functions/effect/remove.json
@@ -24,6 +24,7 @@
         "asset:effect/0607.sedation/_/remove",
         "asset:effect/0608.sinking/_/remove",
         "asset:effect/0612.infringement/_/remove",
-        "asset:effect/0613.white_curse/_/remove"
+        "asset:effect/0613.white_curse/_/remove",
+        "asset:effect/0124.darkness/_/remove"
     ]
-}
+}
\ No newline at end of file
diff --git a/Asset/data/asset/tags/functions/effect/tick.json b/Asset/data/asset/tags/functions/effect/tick.json
index b425387e3e..baace6b41c 100644
--- a/Asset/data/asset/tags/functions/effect/tick.json
+++ b/Asset/data/asset/tags/functions/effect/tick.json
@@ -26,6 +26,7 @@
         "asset:effect/0607.sedation/_/tick",
         "asset:effect/0608.sinking/_/tick",
         "asset:effect/0612.infringement/_/tick",
-        "asset:effect/0613.white_curse/_/tick"
+        "asset:effect/0613.white_curse/_/tick",
+        "asset:effect/0124.darkness/_/tick"
     ]
-}
+}
\ No newline at end of file