diff --git a/migrations/archive/mystery-items-old.js b/migrations/archive/mystery-items-old.js
deleted file mode 100644
index d298d9b7e7..0000000000
--- a/migrations/archive/mystery-items-old.js
+++ /dev/null
@@ -1,110 +0,0 @@
-import monk from 'monk';
-import nconf from 'nconf';
-
-const migrationName = 'mystery-items-201808.js'; // Update per month
-const authorName = 'Sabe'; // in case script author needs to know when their ...
-const authorUuid = '7f14ed62-5408-4e1b-be83-ada62d504931'; // ... own data is done
-
-/*
- * Award this month's mystery items to subscribers
- */
-const MYSTERY_ITEMS = ['armor_mystery_201810', 'head_mystery_201810'];
-const CONNECTION_STRING = nconf.get('MIGRATION_CONNECT_STRING');
-
-let dbUsers = monk(CONNECTION_STRING).get('users', { castIds: false });
-let UserNotification = require('../../website/server/models/userNotification').model;
-
-function processUsers (lastId) {
-  // specify a query to limit the affected users (empty for all users):
-  let query = {
-    migration: {$ne: migrationName},
-    'purchased.plan.customerId': { $ne: null },
-    $or: [
-      { 'purchased.plan.dateTerminated': { $gte: new Date() } },
-      { 'purchased.plan.dateTerminated': { $exists: false } },
-      { 'purchased.plan.dateTerminated': { $eq: null } },
-    ],
-  };
-
-  if (lastId) {
-    query._id = {
-      $gt: lastId,
-    };
-  }
-
-  dbUsers.find(query, {
-    sort: {_id: 1},
-    limit: 250,
-    fields: [
-    ], // specify fields we are interested in to limit retrieved data (empty if we're not reading data):
-  })
-    .then(updateUsers)
-    .catch((err) => {
-      console.log(err);
-      return exiting(1, `ERROR! ${  err}`);
-    });
-}
-
-let progressCount = 1000;
-let count = 0;
-
-function updateUsers (users) {
-  if (!users || users.length === 0) {
-    console.warn('All appropriate users found and modified.');
-    displayData();
-    return;
-  }
-
-  let userPromises = users.map(updateUser);
-  let lastUser = users[users.length - 1];
-
-  return Promise.all(userPromises)
-    .then(() => {
-      processUsers(lastUser._id);
-    });
-}
-
-function updateUser (user) {
-  count++;
-
-  const addToSet = {
-    'purchased.plan.mysteryItems': {
-      $each: MYSTERY_ITEMS,
-    },
-  };
-  const push = {
-    notifications: (new UserNotification({
-      type: 'NEW_MYSTERY_ITEMS',
-      data: {
-        MYSTERY_ITEMS,
-      },
-    })).toJSON(),
-  };
-
-  dbUsers.update({_id: user._id}, {$addToSet: addToSet, $push: push});
-
-  if (count % progressCount === 0) console.warn(`${count  } ${  user._id}`);
-  if (user._id === authorUuid) console.warn(`${authorName  } processed`);
-}
-
-function displayData () {
-  console.warn(`\n${  count  } users processed\n`);
-  return exiting(0);
-}
-
-function exiting (code, msg) {
-  code = code || 0; // 0 = success
-  if (code && !msg) {
-    msg = 'ERROR!';
-  }
-  if (msg) {
-    if (code) {
-      console.error(msg);
-    } else      {
-      console.log(msg);
-    }
-  }
-  process.exit(code);
-}
-
-module.exports = processUsers;
diff --git a/migrations/users/mystery-items.js b/migrations/users/mystery-items.js
deleted file mode 100644
index 60357445b8..0000000000
--- a/migrations/users/mystery-items.js
+++ /dev/null
@@ -1,72 +0,0 @@
-/* eslint-disable no-console */
-import { model as User } from '../../website/server/models/user';
-import { model as UserNotification } from '../../website/server/models/userNotification';
-
-const MIGRATION_NAME = 'mystery_items_201911';
-const MYSTERY_ITEMS = ['weapon_mystery_201911', 'head_mystery_201911'];
-
-const progressCount = 1000;
-let count = 0;
-
-async function updateUser (user) {
-  count += 1;
-
-  const addToSet = {
-    'purchased.plan.mysteryItems': {
-      $each: MYSTERY_ITEMS,
-    },
-  };
-  const push = {
-    notifications: (new UserNotification({
-      type: 'NEW_MYSTERY_ITEMS',
-      data: {
-        MYSTERY_ITEMS,
-      },
-    })).toJSON(),
-  };
-  const set = {
-    migration: MIGRATION_NAME,
-  };
-
-  if (count % progressCount === 0) console.warn(`${count} ${user._id}`);
-
-  return User.update({ _id: user._id }, { $set: set, $push: push, $addToSet: addToSet }).exec();
-}
-
-export default async function processUsers () {
-  const query = {
-    migration: { $ne: MIGRATION_NAME },
-    'purchased.plan.customerId': { $ne: null },
-    $or: [
-      { 'purchased.plan.dateTerminated': { $gte: new Date() } },
-      { 'purchased.plan.dateTerminated': { $exists: false } },
-      { 'purchased.plan.dateTerminated': { $eq: null } },
-    ],
-  };
-
-  const fields = {
-    _id: 1,
-  };
-
-  while (true) { // eslint-disable-line no-constant-condition
-    const users = await User // eslint-disable-line no-await-in-loop
-      .find(query)
-      .limit(250)
-      .sort({ _id: 1 })
-      .select(fields)
-      .lean()
-      .exec();
-
-    if (users.length === 0) {
-      console.warn('All appropriate users found and modified.');
-      console.warn(`\n${count} users processed\n`);
-      break;
-    } else {
-      query._id = {
-        $gt: users[users.length - 1],
-      };
-    }
-
-    await Promise.all(users.map(updateUser)); // eslint-disable-line no-await-in-loop
-  }
-}
diff --git a/website/common/locales/en/gear.json b/website/common/locales/en/gear.json
index 4c70bfb3ff..cefcd8e2c0 100644
--- a/website/common/locales/en/gear.json
+++ b/website/common/locales/en/gear.json
@@ -1411,6 +1411,8 @@
   "headMystery201910Notes": "These flames reveal arcane secrets before your very eyes! Confers no benefit. October 2019 Subscriber Item.",
   "headMystery201911Text": "Charmed Crystal Hat",
   "headMystery201911Notes": "Each of the crystal points attached to this hat endows you with a special power: mystic clairvoyance, arcane wisdom, and... sorcerous plate spinning? All right then. Confers no benefit. December 2019 Subscriber Item.",
+  "headMystery201912Text": "Polar Pixie Crown",
+  "headMystery201912Notes": "This glittering snowflake grants you resistance to the biting cold no matter how high you fly! Confers no benefit. December 2019 Subscriber Item.",
   "headMystery301404Text": "Fancy Top Hat",
   "headMystery301404Notes": "A fancy top hat for the finest of gentlefolk! January 3015 Subscriber Item. Confers no benefit.",
   "headMystery301405Text": "Basic Top Hat",
@@ -1876,6 +1878,8 @@
   "backMystery201805Notes": "This gorgeous feathery tail is perfect for a strut down a lovely garden path! Confers no benefit. May 2018 Subscriber Item.",
   "backMystery201905Text": "Dazzling Dragon Wings",
   "backMystery201905Notes": "Fly to untold realms with these iridescent wings. Confers no benefit. May 2019 Subscriber Item.",
+  "backMystery201912Text": "Polar Pixie Wings",
+  "backMystery201912Notes": "Glide silently across sparkling snowfields and shimmering mountains with these icy wings. Confers no benefit. December 2019 Subscriber Item.",
 
   "backSpecialWonderconRedText": "Mighty Cape",
   "backSpecialWonderconRedNotes": "Swishes with strength and beauty. Confers no benefit. Special Edition Convention Item.",
diff --git a/website/common/locales/en/subscriber.json b/website/common/locales/en/subscriber.json
index fd310139a4..94d85761eb 100644
--- a/website/common/locales/en/subscriber.json
+++ b/website/common/locales/en/subscriber.json
@@ -165,6 +165,7 @@
     "mysterySet201909": "Affable Acorn Set",
     "mysterySet201910": "Cryptic Flame Set",
     "mysterySet201911": "Crystal Charmer Set",
+    "mysterySet201912": "Polar Pixie Set",
     "mysterySet301404": "Steampunk Standard Set",
     "mysterySet301405": "Steampunk Accessories Set",
     "mysterySet301703": "Peacock Steampunk Set",
diff --git a/website/common/script/content/gear/sets/mystery.js b/website/common/script/content/gear/sets/mystery.js
index 28c8800783..f7e9b2c898 100644
--- a/website/common/script/content/gear/sets/mystery.js
+++ b/website/common/script/content/gear/sets/mystery.js
@@ -394,6 +394,12 @@ const back = {
     mystery: '201905',
     value: 0,
   },
+  201912: {
+    text: t('backMystery201912Text'),
+    notes: t('backMystery201912Notes'),
+    mystery: '201912',
+    value: 0,
+  },
 };
 
 const body = {
@@ -763,6 +769,12 @@ const head = {
     mystery: '201911',
     value: 0,
   },
+  201912: {
+    text: t('headMystery201912Text'),
+    notes: t('headMystery201912Notes'),
+    mystery: '201912',
+    value: 0,
+  },
   301404: {
     text: t('headMystery301404Text'),
     notes: t('headMystery301404Notes'),
diff --git a/website/raw_sprites/spritesmith/gear/events/mystery_201912/back_mystery_201912.png b/website/raw_sprites/spritesmith/gear/events/mystery_201912/back_mystery_201912.png
new file mode 100644
index 0000000000..26105949fe
Binary files /dev/null and b/website/raw_sprites/spritesmith/gear/events/mystery_201912/back_mystery_201912.png differ
diff --git a/website/raw_sprites/spritesmith/gear/events/mystery_201912/head_mystery_201912.png b/website/raw_sprites/spritesmith/gear/events/mystery_201912/head_mystery_201912.png
new file mode 100644
index 0000000000..20f8a594f2
Binary files /dev/null and b/website/raw_sprites/spritesmith/gear/events/mystery_201912/head_mystery_201912.png differ
diff --git a/website/raw_sprites/spritesmith/gear/events/mystery_201912/shop_back_mystery_201912.png b/website/raw_sprites/spritesmith/gear/events/mystery_201912/shop_back_mystery_201912.png
new file mode 100644
index 0000000000..ecc8a3be4d
Binary files /dev/null and b/website/raw_sprites/spritesmith/gear/events/mystery_201912/shop_back_mystery_201912.png differ
diff --git a/website/raw_sprites/spritesmith/gear/events/mystery_201912/shop_head_mystery_201912.png b/website/raw_sprites/spritesmith/gear/events/mystery_201912/shop_head_mystery_201912.png
new file mode 100644
index 0000000000..e2a8b8f975
Binary files /dev/null and b/website/raw_sprites/spritesmith/gear/events/mystery_201912/shop_head_mystery_201912.png differ
diff --git a/website/raw_sprites/spritesmith/gear/events/mystery_201912/shop_set_mystery_201912.png b/website/raw_sprites/spritesmith/gear/events/mystery_201912/shop_set_mystery_201912.png
new file mode 100644
index 0000000000..1b9076992a
Binary files /dev/null and b/website/raw_sprites/spritesmith/gear/events/mystery_201912/shop_set_mystery_201912.png differ
diff --git a/website/raw_sprites/spritesmith_large/promo_mystery_201912.png b/website/raw_sprites/spritesmith_large/promo_mystery_201912.png
new file mode 100644
index 0000000000..3cee5d819b
Binary files /dev/null and b/website/raw_sprites/spritesmith_large/promo_mystery_201912.png differ