diff --git a/db/migrate/20251203184819_create_artifacts.rb b/db/migrate/20251203184819_create_artifacts.rb
new file mode 100644
index 0000000..4f713fc
--- /dev/null
+++ b/db/migrate/20251203184819_create_artifacts.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+class CreateArtifacts < ActiveRecord::Migration[8.0]
+  def change
+    create_table :artifacts, id: :uuid do |t|
+      t.string :granblue_id, null: false
+      t.string :name_en, null: false
+      t.string :name_jp
+      t.integer :proficiency
+      t.integer :rarity, null: false, default: 0
+      t.date :release_date
+
+      # No timestamps - static reference data
+    end
+
+    add_index :artifacts, :granblue_id, unique: true
+    add_index :artifacts, :proficiency
+    add_index :artifacts, :rarity
+  end
+end
diff --git a/db/migrate/20251203184919_create_collection_artifacts.rb b/db/migrate/20251203184919_create_collection_artifacts.rb
new file mode 100644
index 0000000..76f2253
--- /dev/null
+++ b/db/migrate/20251203184919_create_collection_artifacts.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+class CreateCollectionArtifacts < ActiveRecord::Migration[8.0]
+  def change
+    create_table :collection_artifacts, id: :uuid do |t|
+      t.references :user, type: :uuid, null: false, foreign_key: true
+      t.references :artifact, type: :uuid, null: false, foreign_key: true
+
+      t.integer :element, null: false
+      t.integer :proficiency  # Only for quirk artifacts (random proficiency assigned by game)
+      t.integer :level, null: false, default: 1
+      t.string :nickname
+
+      # Skills (JSONB) - each contains: { modifier: int, strength: value, level: int }
+      t.jsonb :skill1, default: {}, null: false
+      t.jsonb :skill2, default: {}, null: false
+      t.jsonb :skill3, default: {}, null: false
+      t.jsonb :skill4, default: {}, null: false
+
+      t.timestamps
+    end
+
+    add_index :collection_artifacts, [:user_id, :artifact_id]
+    add_index :collection_artifacts, :element
+  end
+end
diff --git a/db/migrate/20251203185443_create_grid_artifacts.rb b/db/migrate/20251203185443_create_grid_artifacts.rb
new file mode 100644
index 0000000..15bee9a
--- /dev/null
+++ b/db/migrate/20251203185443_create_grid_artifacts.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class CreateGridArtifacts < ActiveRecord::Migration[8.0]
+  def change
+    create_table :grid_artifacts, id: :uuid do |t|
+      # One artifact per character - unique index created by references
+      t.references :grid_character, type: :uuid, null: false, foreign_key: true, index: { unique: true }
+      t.references :artifact, type: :uuid, null: false, foreign_key: true
+
+      t.integer :element, null: false
+      t.integer :proficiency  # Only for quirk artifacts (random proficiency assigned by game)
+      t.integer :level, null: false, default: 1
+
+      # Skills (JSONB) - each contains: { modifier: int, strength: value, level: int }
+      t.jsonb :skill1, default: {}, null: false
+      t.jsonb :skill2, default: {}, null: false
+      t.jsonb :skill3, default: {}, null: false
+      t.jsonb :skill4, default: {}, null: false
+
+      t.timestamps
+    end
+  end
+end
diff --git a/db/migrate/20251203195857_create_artifact_skills.rb b/db/migrate/20251203195857_create_artifact_skills.rb
new file mode 100644
index 0000000..3f89036
--- /dev/null
+++ b/db/migrate/20251203195857_create_artifact_skills.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+class CreateArtifactSkills < ActiveRecord::Migration[8.0]
+  def change
+    create_table :artifact_skills, id: :uuid do |t|
+      t.integer :skill_group, null: false  # 1, 2, or 3
+      t.integer :modifier, null: false     # Skill ID within the group
+
+      t.string :name_en, null: false
+      t.string :name_jp, null: false
+
+      t.jsonb :base_values, null: false, default: []
+      t.decimal :growth, precision: 15, scale: 2
+      t.string :suffix_en, default: ''
+      t.string :suffix_jp, default: ''
+      t.string :polarity, null: false, default: 'positive'
+
+      # No timestamps - static reference data
+    end
+
+    add_index :artifact_skills, [:skill_group, :modifier], unique: true
+    add_index :artifact_skills, :skill_group
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index db215ba..843ac3b 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_12_03_173746) do
+ActiveRecord::Schema[8.0].define(version: 2025_12_03_195857) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "btree_gin"
   enable_extension "pg_catalog.plpgsql"
@@ -23,6 +23,32 @@ ActiveRecord::Schema[8.0].define(version: 2025_12_03_173746) do
     t.string "version"
   end
 
+  create_table "artifact_skills", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
+    t.integer "skill_group", null: false
+    t.integer "modifier", null: false
+    t.string "name_en", null: false
+    t.string "name_jp", null: false
+    t.jsonb "base_values", default: [], null: false
+    t.decimal "growth", precision: 15, scale: 2
+    t.string "suffix_en", default: ""
+    t.string "suffix_jp", default: ""
+    t.string "polarity", default: "positive", null: false
+    t.index ["skill_group", "modifier"], name: "index_artifact_skills_on_skill_group_and_modifier", unique: true
+    t.index ["skill_group"], name: "index_artifact_skills_on_skill_group"
+  end
+
+  create_table "artifacts", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
+    t.string "granblue_id", null: false
+    t.string "name_en", null: false
+    t.string "name_jp"
+    t.integer "proficiency"
+    t.integer "rarity", default: 0, null: false
+    t.date "release_date"
+    t.index ["granblue_id"], name: "index_artifacts_on_granblue_id", unique: true
+    t.index ["proficiency"], name: "index_artifacts_on_proficiency"
+    t.index ["rarity"], name: "index_artifacts_on_rarity"
+  end
+
   create_table "awakenings", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
     t.string "name_en", null: false
     t.string "name_jp", null: false
@@ -111,6 +137,25 @@ ActiveRecord::Schema[8.0].define(version: 2025_12_03_173746) do
     t.index ["skill_id"], name: "index_charge_attacks_on_skill_id"
   end
 
+  create_table "collection_artifacts", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
+    t.uuid "user_id", null: false
+    t.uuid "artifact_id", null: false
+    t.integer "element", null: false
+    t.integer "proficiency"
+    t.integer "level", default: 1, null: false
+    t.string "nickname"
+    t.jsonb "skill1", default: {}, null: false
+    t.jsonb "skill2", default: {}, null: false
+    t.jsonb "skill3", default: {}, null: false
+    t.jsonb "skill4", default: {}, null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["artifact_id"], name: "index_collection_artifacts_on_artifact_id"
+    t.index ["element"], name: "index_collection_artifacts_on_element"
+    t.index ["user_id", "artifact_id"], name: "index_collection_artifacts_on_user_id_and_artifact_id"
+    t.index ["user_id"], name: "index_collection_artifacts_on_user_id"
+  end
+
   create_table "collection_characters", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
     t.uuid "user_id", null: false
     t.uuid "character_id", null: false
@@ -241,6 +286,22 @@ ActiveRecord::Schema[8.0].define(version: 2025_12_03_173746) do
     t.index ["gacha_id"], name: "index_gacha_rateups_on_gacha_id"
   end
 
+  create_table "grid_artifacts", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
+    t.uuid "grid_character_id", null: false
+    t.uuid "artifact_id", null: false
+    t.integer "element", null: false
+    t.integer "proficiency"
+    t.integer "level", default: 1, null: false
+    t.jsonb "skill1", default: {}, null: false
+    t.jsonb "skill2", default: {}, null: false
+    t.jsonb "skill3", default: {}, null: false
+    t.jsonb "skill4", default: {}, null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["artifact_id"], name: "index_grid_artifacts_on_artifact_id"
+    t.index ["grid_character_id"], name: "index_grid_artifacts_on_grid_character_id", unique: true
+  end
+
   create_table "grid_characters", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
     t.uuid "party_id"
     t.uuid "character_id"
@@ -762,6 +823,8 @@ ActiveRecord::Schema[8.0].define(version: 2025_12_03_173746) do
   add_foreign_key "character_skills", "skills", column: "alt_skill_id"
   add_foreign_key "charge_attacks", "skills"
   add_foreign_key "charge_attacks", "skills", column: "alt_skill_id"
+  add_foreign_key "collection_artifacts", "artifacts"
+  add_foreign_key "collection_artifacts", "users"
   add_foreign_key "collection_characters", "awakenings"
   add_foreign_key "collection_characters", "characters"
   add_foreign_key "collection_characters", "users"
@@ -779,6 +842,8 @@ ActiveRecord::Schema[8.0].define(version: 2025_12_03_173746) do
   add_foreign_key "effects", "effects", column: "effect_family_id"
   add_foreign_key "favorites", "parties"
   add_foreign_key "favorites", "users"
+  add_foreign_key "grid_artifacts", "artifacts"
+  add_foreign_key "grid_artifacts", "grid_characters"
   add_foreign_key "grid_characters", "awakenings"
   add_foreign_key "grid_characters", "characters"
   add_foreign_key "grid_characters", "parties"