Battle Postcards are a special customization feature for the Arena in Doom & Destiny: Advanced. These postcards unlock new offline battlefields in which your opponents fight you in offline network battles at the Arena. The battlefields are also refered to as "BattleBacks" (short for "Battle Background") at the Arena's Red Crystal menu.
Not only do postcards modify the appearance of your battlefield, they also give special bonuses to teams during offline fights.
Postcards can be found in many locations during your adventurers but they can also be bought at the Arena's postcard shop (at the north west of the main arena area).
Postcards Found While Adventuring Edit
The following postcards can be found as you explore areas during the storyline or during the post-game:
Postcard I (1): Left of the merchant trading 12 Nuggets for 12 Spellbooks, across a swinging rope.
Postcard II (2): Shire Pizzeria, in the music-locked chest.
Postcard III (3): Imperial City, Hospitality Quarter, in the park area to the northwest, hidden behind the southern tree.
Postcard IV (4): Ivory Tower ballroom, in the music-locked chest.
Postcard V (5): Located in the inn of the new town that was added south of where you find the Plateau Lance.
Postcard VI (6): Northwest of Castle Town, in the snow area with barbarians and Famished Gate, click behind the far right tree.
Postcard VII (7): Gate between Imperial City and the Labyrinth, across a swinging rope.
Postcard VIII (8): Swampy Town, across a swinging rope.
Postcard XXXVI (36): In Sushi Town on Demon Island, in the western part of the city, there is a summoner kid in front of a chest. Defeat him to claim the postcard in the small orange chest.
Postcards Sold at the Arena Edit
You can buy cards from Master Muscle at the battle postcard shop, north west (up and to the right) of the first arena area.
You have two options to buy a postcard at the arena's postcard shop:
Buy a random battle postcard for 5 .
Buy a specific postcard by interacting with an unsold postcard picture on the walls of the shop.
Battle postcards I to XXXVII (1 to 37) cost 25 .
Battle postcard XXXVIII (38) costs 50 .
You can set or change your current offline battle background ("BattleBack") at the Red Crystals found at the Arena ("Set up Online Battles!" > BattleBack > (choose one) > Select "Set Current").
Arena - Speaking to Master Muscle at the Battle Postcard Shop.
Buying a specific Postcard at the arena shop.
Arena - BattleBack Menu (to change your offline battleground)
Postcards in the Inventory Edit
To see which battle postcards you currently own and hence which battlefields are unlocked, you can find them in the regular menu under Menu > Inventory > Artifact.
There are 38 different battle postcards in the game:
Battle Postcard I (1)
Countryside: Regenerate HP to all
Battle Postcard II (2)
Dirt Road: +10 agility to all
Battle Postcard III (3)
City Street: +10 Skill to all
Battle Postcard IV (4)
Badlands: -10 Critical to all
Battle Postcard V (5)
Oasis: Regenerate MP to all
Battle Postcard VI (6)
Snow Land: Cold to all
Battle Postcard VII (7)
Stone Bridge: +40% Physical resistance to all
Battle Postcard VIII (8)
Swamp: Poison to all
Battle Postcard IX (9)
Warped Crypt: Confusion to enemies
Battle Postcard X (10)
Crypt: Fear to enemies
Battle Postcard XI (11)
Farm: +10 Skill to allies
Battle Postcard XII (12)
MagiSewer: -40% Magic resistance to all
Battle Postcard XIII (13)
MagiTower: +40% Magic resistance to allies
Battle Postcard XIV (14)
Ginger Castle: +40% Holy resistance to allies
Battle Postcard XV (15)
God Volta's Labyrinth: -40% Lightning resistance to enemies
Battle Postcard XVI (16)
Plateau's Ruins: -40% Fire resistance to enemies
Battle Postcard XVII (17)
Mole People's Ziggurat: +10 Reflex to allies
Battle Postcard XVIII (18)
Steele's Office: +10 agility to allies
Battle Postcard XIX (19)
Dark Eidous' Mountain: +10 Critical to allies
Battle Postcard XX (20)
Steele's Secret Lab: +40% Void resistance to all
Battle Postcard XXI (21)
Tomb: +40% Profane resistance to allies
Battle Postcard XXII (22)
Evil Altar: -40% profane resistance to enemies
Battle Postcard XXIII (23) 1
Boneburg Tomb: +60% Profane resistance to all
Battle Postcard XXIV (24)
Dark Chasm: -60% Profane resistance to all
Battle Postcard XXV (25)
Sugary Land: -40% Holy resistance to enemies
Battle Postcard XXVI (26)
Holy Spaghetti Temple: +60% Holy resistance to all
Battle Postcard XXVII (27)
Doom's Throne Room: -60% Holy resistance to all
Battle Postcard XXVIII (28)
God Volta's Temple: +40% Lightning resistance to all
Battle Postcard XXIX (29)
Steele's R&D Lab: +60% Lightning resistance to all
Battle Postcard XXX (30)
Snow Canyon: +40% Ice resistance to allies
Battle Postcard XXXI (31)
Snow Forest: -40% Ice resistance to enemies
Battle Postcard XXXII (32)
Warm Oasis: +60% Ice resistance to all
Battle Postcard XXXIII (33)
Plateau Temple: +40% Fire resistance to allies
Battle Postcard XXXIV (34)
Lava Cave: -60% Fire resistance to all
Battle Postcard XXXV (35)
Lightning Gym: +60% Lightning resistance to all
Battle Postcard XXXVI (36)
Ice Gym: +60% Ice resistance to all
Battle Postcard XXXVII (37)
Fire Gym: +60% Fire resistance to all
Battle Postcard XXXVIII (38)
Stadium: +20 "Cos" to allies, - 20 "Cos" to enemies
1 : Warning: Battle Postcard XXIII (23) is sold as "XXII" (22) at the Arena postcard shop.