diff --git a/projects/1.21/assets/dark-doppelganger/darkdoppelganger/lang/en_us.json b/projects/1.21/assets/dark-doppelganger/darkdoppelganger/lang/en_us.json
new file mode 100644
index 000000000000..d649784e58b3
--- /dev/null
+++ b/projects/1.21/assets/dark-doppelganger/darkdoppelganger/lang/en_us.json
@@ -0,0 +1,28 @@
+{
+  "item.darkdoppelganger.summon_scroll": "Summon Scroll",
+  "item.darkdoppelganger.shadow_orb": "Shadow Orb",
+  "item.darkdoppelganger.doppelganger_ring": "Doppelganger Ring",
+  "item.darkdoppelganger.elder_necklace": "Elder's Necklace",
+  "item.darkdoppelganger.summons_necklace": "Summoner's Necklace",
+  "itemGroup.darkdoppelganger.example_tab": "Dark Doppelganger Tab",
+  "item.darkdoppelganger.summon_scroll.tooltip": "Use this to summon the Dark Doppelganger!",
+  "advancement.kill_dark_doppelganger.title": "Dark Doppelganger Slayer",
+  "advancement.kill_dark_doppelganger.description": "Defeated the Dark Doppelganger. A reward awaits!",
+
+  "advancement.summon_dark_doppelganger.title": "Dark Doppelganger Awakened",
+  "advancement.summon_dark_doppelganger.description": "Use the summoning scroll to call forth the Dark Doppelganger.",
+  "spell.irons_spellbooks.doppel_portal": "Portal Jump",
+  "spell.darkdoppelganger.doppel_portal": "Portal Jump",
+  "tooltip.doppelganger.passive_ability": "Passive Ability Cooldown: %s seconds",
+  "tooltip.doppelganger.health_bonus": "Grants +%s Max Health",
+  "tooltip.doppelganger.cooldown_reduction": "Reduces Cooldown by %s",
+  "itemGroup.items.darkdoppelganger": "Dark DoppelGanger",
+  "itemGroup.item.darkdoppelganger": "Dark Doppelganger",
+  "spell.irons_spellbooks.doppel_portal.guide": "Enter through a portal summoned in front of you to exit through another portal some blocks away.",
+  "spell.irons_spellbooks.summon_doppel_minion": "Summon Minion",
+  "spell.darkdoppelganger.summon_doppel_minion": "Summon Minion",
+  "spell.irons_spellbooks.summon_doppel_minion.guide": "Able to summon 1 minion to fight at your side from the Dark Doppelgangers dimension.",
+  "itemGroup.darkdoppelganger.doppelganger_tab": "Dark Doppelganger",
+  "orb.tooltip1": "Let it fall...",
+  "orb.tooltip2": "In The End, it will not stay gone."
+}
diff --git a/projects/1.21/assets/dark-doppelganger/darkdoppelganger/lang/zh_cn.json b/projects/1.21/assets/dark-doppelganger/darkdoppelganger/lang/zh_cn.json
new file mode 100644
index 000000000000..ee3cf172b524
--- /dev/null
+++ b/projects/1.21/assets/dark-doppelganger/darkdoppelganger/lang/zh_cn.json
@@ -0,0 +1,28 @@
+{
+  "item.darkdoppelganger.summon_scroll": "召唤卷轴",
+  "item.darkdoppelganger.shadow_orb": "暗影宝珠",
+  "item.darkdoppelganger.doppelganger_ring": "分身戒指",
+  "item.darkdoppelganger.elder_necklace": "长者项链",
+  "item.darkdoppelganger.summons_necklace": "召唤师项链",
+  "itemGroup.darkdoppelganger.example_tab": "暗影分身标签页",
+  "item.darkdoppelganger.summon_scroll.tooltip": "使用此物品召唤暗影分身！",
+  "advancement.kill_dark_doppelganger.title": "暗影分身猎手",
+  "advancement.kill_dark_doppelganger.description": "击败了暗影分身。丰厚的奖励等着你！",
+  
+  "advancement.summon_dark_doppelganger.title": "暗影分身觉醒",
+  "advancement.summon_dark_doppelganger.description": "使用召唤卷轴召唤出暗影分身。",
+  "spell.irons_spellbooks.doppel_portal": "传送之门",
+  "spell.darkdoppelganger.doppel_portal": "传送之门",
+  "tooltip.doppelganger.passive_ability": "被动技能冷却：%s 秒",
+  "tooltip.doppelganger.health_bonus": "提供 +%s 最大生命值",
+  "tooltip.doppelganger.cooldown_reduction": "冷却时间减少 %s",
+  "itemGroup.items.darkdoppelganger": "暗影分身",
+  "itemGroup.item.darkdoppelganger": "暗影分身",
+  "spell.irons_spellbooks.doppel_portal.guide": "进入你面前召唤的传送门，从远处另一个传送门穿出。",
+  "spell.irons_spellbooks.summon_doppel_minion": "召唤仆从",
+  "spell.darkdoppelganger.summon_doppel_minion": "召唤仆从",
+  "spell.irons_spellbooks.summon_doppel_minion.guide": "从暗影分身维度召唤1个仆从为你战斗。",
+  "itemGroup.darkdoppelganger.doppelganger_tab": "暗影分身",
+  "orb.tooltip1": "让它坠落...",
+  "orb.tooltip2": "在末路之时，它不会真正消失。"
+}
\ No newline at end of file