diff --git a/fftcg/book.py b/fftcg/book.py
index 583bf78..f7dfdae 100644
--- a/fftcg/book.py
+++ b/fftcg/book.py
@@ -5,7 +5,7 @@ from PIL import Image
 
 from .cards import Cards
 from .imageloader import ImageLoader
-from .utils import GRID, RESOLUTION, BOOK_YML_NAME
+from .utils import GRID, RESOLUTION, BOOK_YML_NAME, CARD_BACK_URL
 
 
 class Book:
@@ -18,10 +18,8 @@ class Book:
 
         # all card face URLs
         urls = [f"https://fftcg.cdn.sewest.net/images/cards/full/{card.code}_{language}.jpg" for card in cards]
-        # card back URL (image by Aurik)
-        urls.append(
-            "http://cloud-3.steamusercontent.com/ugc/948455238665576576/85063172B8C340602E8D6C783A457122F53F7843/"
-        )
+        # card back URL
+        urls.append(CARD_BACK_URL)
 
         # multi-threaded download
         images = ImageLoader.load(urls, language, num_threads)
diff --git a/fftcg/card.py b/fftcg/card.py
index ea8b014..04edd83 100644
--- a/fftcg/card.py
+++ b/fftcg/card.py
@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import json
 import re
 
 import yaml
@@ -23,8 +22,6 @@ class Card(yaml.YAMLObject):
         "闇": "Darkness"
     }
 
-    __ELEMENTS = "".join(__ELEMENTS_MAP.keys())
-
     def __init__(self, code, elements, name, text):
         self.__code = code
         self.__elements = elements
@@ -55,15 +52,15 @@ class Card(yaml.YAMLObject):
             # place other letter and numerical cost symbols
             text = re.sub(r"《([a-z0-9])》", sub_encircle, text, flags=re.IGNORECASE)
             # place elemental cost symbols
-            text = re.sub(rf"《([{Card.__ELEMENTS}])》", sub_elements, text, flags=re.IGNORECASE)
+            text = re.sub(rf"《([{''.join(Card.__ELEMENTS_MAP.keys())}])》", sub_elements, text, flags=re.IGNORECASE)
             # place dull symbols
             text = text.replace("《ダル》", "[⤵]")
             # replace formatting hints with brackets
-            text = re.sub(r"\[\[[a-z]\]\]([^\[]*?)\s*\[\[/\]\]\s*", r"[\1] ", text, flags=re.IGNORECASE)
+            text = re.sub(r"\[\[[a-z]]]([^\[]*?)\s*\[\[/]]\s*", r"[\1] ", text, flags=re.IGNORECASE)
             # place EX-BURST markers
-            text = re.sub(r"\[\[ex\]\]\s*EX BURST\s*\[\[/\]\]\s*", r"[EX BURST] ", text, flags=re.IGNORECASE)
+            text = re.sub(r"\[\[ex]]\s*EX BURST\s*\[\[/]]\s*", r"[EX BURST] ", text, flags=re.IGNORECASE)
             # place line breaks
-            text = re.sub(r"\s*\[\[br\]\]\s*", "\n\n", text, flags=re.IGNORECASE)
+            text = re.sub(r"\s*\[\[br]]\s*", "\n\n", text, flags=re.IGNORECASE)
 
             return cls(
                 code=Code(data["Code"]),
@@ -75,9 +72,6 @@ class Card(yaml.YAMLObject):
     def __str__(self) -> str:
         return f"'{self.__name}' ({'/'.join(self.__elements)}, {self.code})"
 
-    def to_json(self) -> str:
-        return json.dumps(self, default=lambda o: o.__dict__)
-
     # 6-048C
     @property
     def code(self) -> Code:
diff --git a/fftcg/cards.py b/fftcg/cards.py
index 3cc1162..eb4c27e 100644
--- a/fftcg/cards.py
+++ b/fftcg/cards.py
@@ -6,6 +6,22 @@ from .card import Card
 class Cards(list[Card]):
     __API_URL = "https://fftcg.square-enix-games.com/de/get-cards"
 
+    def __init__(self, name):
+        super().__init__()
+
+        self.__name = name
+
+    def __str__(self) -> str:
+        return f"[{', '.join(str(card) for card in self)}]"
+
+    @property
+    def name(self) -> str:
+        return self.__name
+
+    @property
+    def file_name(self) -> str:
+        return self.name.lower().replace(" ", "_")
+
     def _load(self, params: dict[str, any]):
         # required params:
         #  text
@@ -20,6 +36,3 @@ class Cards(list[Card]):
         req = requests.post(Cards.__API_URL, json=params)
         self.clear()
         self.extend([Card.from_data(card_data, "EN") for card_data in req.json()["cards"]])
-
-    def __str__(self) -> str:
-        return "\n".join(str(card) for card in self)
diff --git a/fftcg/opus.py b/fftcg/opus.py
index 6f3cd76..1cdaf0f 100644
--- a/fftcg/opus.py
+++ b/fftcg/opus.py
@@ -8,34 +8,31 @@ from .ttsdeck import TTSDeck
 
 class Opus(Cards):
     def __init__(self, opus_id: str):
-        super().__init__()
 
         logger = logging.getLogger(__name__)
 
         if opus_id.isnumeric():
-            self.__name = f"Opus {roman.toRoman(int(opus_id)).upper()}"
+            name = f"Opus {opus_id}"
             self.__number = opus_id
-            self.__filename = f"opus_{opus_id}"
-            params = {"set": [self.__name]}
+            params = {"set": [f"Opus {roman.toRoman(int(opus_id)).upper()}"]}
 
         elif opus_id == "chaos":
-            self.__name = "Boss Deck Chaos"
+            name = "Boss Deck Chaos"
             self.__number = "B"
-            self.__filename = "boss_deck_chaos"
-            params = {"set": [self.__name]}
+            params = {"set": [name]}
 
         elif opus_id == "promo":
-            self.__name = "Promo"
+            name = "Promo"
             self.__number = "PR"
-            self.__filename = "promo"
             params = {"rarity": ["pr"]}
 
         else:
-            self.__name = "?"
+            name = "?"
             self.__number = "?"
             self.__filename = "?"
             params = {"set": "?"}
 
+        super().__init__(name)
         self._load(params)
 
         # remove reprints
@@ -50,25 +47,21 @@ class Opus(Cards):
         for card in self:
             logger.info(f"imported card {card}")
 
-    @property
-    def name(self) -> str:
-        return self.__name
-
     @property
     def number(self) -> str:
         return self.__number
 
-    @property
-    def filename(self) -> str:
-        return self.__filename
-
     @property
     def elemental_decks(self) -> list[TTSDeck]:
         if self.name in ["Promo", "Boss Deck Chaos"]:
-            return [TTSDeck([
-                card.code
-                for card in self
-            ])]
+            return [TTSDeck(
+                [
+                    card.code
+                    for card in self
+                ],
+                f"{self.name}",
+                f"All {self.name} Cards in elemental, then alphabetical order"
+            )]
 
         else:
             def element_filter(element: str):
@@ -76,17 +69,21 @@ class Opus(Cards):
 
             # simple cases: create lambdas for base elemental decks
             base_elements = ["Fire", "Ice", "Wind", "Earth", "Lightning", "Water"]
-            filters = [element_filter(elem) for elem in base_elements]
+            filters = {elem: element_filter(elem) for elem in base_elements}
 
-            filters += [
+            filters |= {
                 # light/darkness elemental deck
-                lambda card: card.elements == ["Light"] or card.elements == ["Darkness"],
+                "Light/Darkness": lambda card: card.elements == ["Light"] or card.elements == ["Darkness"],
                 # multi element deck
-                lambda card: len(card.elements) > 1,
-            ]
+                "Multi": lambda card: len(card.elements) > 1,
+            }
 
-            return [TTSDeck([
-                card.code
-                for card in self
-                if f(card)
-            ]) for f in filters]
+            return [TTSDeck(
+                [
+                    card.code
+                    for card in self
+                    if f(card)
+                ],
+                f"{self.name} {elem}",
+                f"All {self.name} Cards with {elem} element in alphabetical order"
+            ) for elem, f in filters.items()]
diff --git a/fftcg/ttsdeck.py b/fftcg/ttsdeck.py
index ba85350..eef0897 100644
--- a/fftcg/ttsdeck.py
+++ b/fftcg/ttsdeck.py
@@ -2,13 +2,17 @@ import json
 
 from .carddb import CardDB
 from .code import Code
+from .utils import CARD_BACK_URL
 
 
 class TTSDeck(list[dict[str, any]]):
-    def __init__(self, codes: list[Code]):
+    def __init__(self, codes: list[Code], name: str, description: str):
         carddb = CardDB.get()
         super().__init__([carddb[code] for code in codes])
 
+        self.__name = name
+        self.__description = description
+
     def __str__(self) -> str:
         face_urls = list(set([entry["file"] for entry in self]))
 
@@ -17,7 +21,7 @@ class TTSDeck(list[dict[str, any]]):
                 "NumWidth": "10",
                 "NumHeight": "7",
                 "FaceURL": url,
-                "BackURL": "http://cloud-3.steamusercontent.com/ugc/948455238665576576/85063172B8C340602E8D6C783A457122F53F7843/",
+                "BackURL": CARD_BACK_URL,
             } for i, url in enumerate(face_urls)
         }
 
@@ -63,8 +67,8 @@ class TTSDeck(list[dict[str, any]]):
         jsondict = {"ObjectStates": [
             {
                 "Name": "Deck",
-                "Nickname": "TODO Deck Name",
-                "Description": "TODO Deck Description",
+                "Nickname": self.__name,
+                "Description": self.__description,
 
                 "Hands": False,
                 "SidewaysCard": False,
@@ -76,3 +80,6 @@ class TTSDeck(list[dict[str, any]]):
         ]}
 
         return json.dumps(jsondict, indent=2)
+
+    def save(self, file_name: str) -> None:
+        pass
diff --git a/fftcg/utils.py b/fftcg/utils.py
index 6024bf9..a21f1df 100644
--- a/fftcg/utils.py
+++ b/fftcg/utils.py
@@ -4,6 +4,8 @@ from .grid import Grid
 GRID = Grid((10, 7))  # default in TTsim: 10 columns, 7 rows
 RESOLUTION = Grid((429, 600))  # default in TTsim: 480x670 pixels per card
 BOOK_YML_NAME = "book.yml"
+# card back URL (image by Aurik)
+CARD_BACK_URL = "http://cloud-3.steamusercontent.com/ugc/948455238665576576/85063172B8C340602E8D6C783A457122F53F7843/"
 
 
 # functions
diff --git a/main.py b/main.py
index 1586f95..11ede61 100755
--- a/main.py
+++ b/main.py
@@ -41,12 +41,13 @@ def main() -> None:
     # main program
     opus = fftcg.Opus(args.opus_id)
     book = fftcg.Book(opus, "eg", args.num_threads)
-    book.save(opus.filename)
+    book.save(opus.file_name)
 
-    # create elemental decks for opus
+    # load the current carddb
     carddb = fftcg.CardDB.get()
     carddb.load()
 
+    # create elemental decks for opus
     for deck in opus.elemental_decks:
         print(deck)