I've been asked about the order and scope of official writings in the Mage Wars universe. Here's the comprehensive list of what's been published.
A Map of Etheria http://forum.arcanewonders.com/index.php?topic=15702.0Background LoreHistory of EtheriaAn overall view of the history of Etheria here, including a timeline
http://forum.arcanewonders.com/index.php?topic=15981.0The Gods of EtheriaAll the Gods, Goddesses and Lords of the Etherian Pantheon
http://forum.arcanewonders.com/index.php?topic=16442.0Calendar of EtheriaHere are the months and festivals celebrated by the people of Etheria.
http://forum.arcanewonders.com/index.php?topic=15980.0Legends and LoreThese regular posts explore the stories behind the people, places and things seen on Arena and Academy cards.
Ludwig Boltstorm:
http://forum.arcanewonders.com/index.php?topic=15891.0
Goran, Werewolf Pet:
http://forum.arcanewonders.com/index.php?topic=15924.0
Celestia and the Angels:
http://forum.arcanewonders.com/index.php?topic=15947.0
The History of Etheria: http://forum.arcanewonders.com/index.php?topic=15981.0
Sistarra, the Grand Academy of Magic:
http://forum.arcanewonders.com/index.php?topic=16000.0
Laws of Magic: http://forum.arcanewonders.com/index.php?topic=16022.0
The Flame Casts Two ShadowsPart 1:
http://forum.arcanewonders.com/index.php?topic=15721.0Part 2:
http://forum.arcanewonders.com/index.php?topic=15727.0If you are interested in the cosmology and magic of the Mage Wars universe, you can find out a lot in this post:
http://forum.arcanewonders.com/index.php?topic=15757.0Main Story LinesThe official main storyline comes from the Organized Play (OP) kits, which get sent out to gaming stores, along with promo cards. They are then posted online for the main community to read and enjoy as well.
Here's a list, and a link where you can read them.
OP 1: Westlock: Dark Prophets OP_DPPROLOGUE, Sean McCoy
OP_DP1: Death of a High Priest, Sean McCoy
OP_DP2: To Save a Priestess, Sean McCoy
OP_DP3: A Warlock in Disguise, Sean McCoy
OP_DP4: Temples Burning, Sean McCoy
http://www.arcanewonders.com/westlock-dark-prophetsOP 2: Allegiance in Blood OP_ABPROLOGUE, Aaron Brosman
OP_AB1: The Rite of Visions, Thomas Allen
OP_AB2: The Ascension of Trokoth the First, Thomas Allen
OP_AB3: Small Minds Laid Waste, Thomas Allen
OP_AB4: Truth Like Blood, William Niebling
OP_AB5: Enemies Without and Within, William Niebling
OP_AB6: Inquisition of the Mind, William Niebling
OP_AB7: A Paladins Virtue, Aaron Brosman
OP_AB8: Siegfrieds Challenge, Aaron Brosman
OP_AB9: Honor Brought with Blood, Aaron Brosman
http://www.arcanewonders.com/allegiance-in-bloodOP 3: Unholy Tides OP_UTPROLOGUE, Aaron Brosman
OP_UT1: Into the Eyrie, Aaron Brosman
OP_UT2: The Court of Towers, Aaron Brosman
OP_UT3: Into the Heart of Darkness, Aaron Brosman
OP_UT4: Encircled in Darkfenne, Aaron Brosman
OP_UT5: The Trail of Death, Aaron Brosman
OP_UT6: Death That Should Not Be, Aaron Brosman
OP_UT7: The Renewing Spring, Aaron Brosman
OP_UT8: The Dead Lake, Aaron Brosman
http://www.arcanewonders.com/unholy-tidesOP 4: Converging Fronts OP CFPROLOGUE, Aaron Brosman
OP CF1: Favor for a Nation, Aaron Brosman
OP CF2: First of the Spires, Aaron Brosman
OP CF3: Reflections of Guilt, Aaron Brosman
OP CF4: The Weight of War, Aaron Brosman
OP CF5: Lessons Old and New, Aaron Brosman
OP CF6: Path of Might, Aaron Brosman
OP CF7: Illusory Preparation, Aaron Brosman
OP CF8: Uninvited Guests, Aaron Brosman
http://www.arcanewonders.com/converging-frontsOP 5: Malignant Intentions OP MIPROLOGUE, Aaron Brosman
http://www.arcanewonders.com/organized-play/malignant-intentionsIn addition, Mage Wars has a published novel, written by Will McDermott. Although there is nothing in the book that definitively places it anywhere along the OP timeline, I think you can probably peg it to sometime in the OP IV/V range.
Mage Wars: Nature of the Beast, Will McDermotthttp://www.amazon.com/Mage-Wars-Nature-Will-McDermott/dp/1606905732There are also two "forum canon" story lines that exist (and continue to run). They draw on the same "global" events, but have characters that are specific to their individual stories. In general, these story lines seek to flesh out the Mage Wars experience to something broader than arena combat, and feel more like an RPG world set in the Etheria universe.
Both begin around the start of OP Kit V and run concurrently.
Forum CanonThe Wanderings of Amadseer the Cursed1. Concerning the Emerald Tegu, Amadseer (Chris Henson)
http://forum.arcanewonders.com/index.php?topic=13186.02. Concerning the Darkfenne, Amadseer (Chris Henson)
http://forum.arcanewonders.com/index.php?topic=13190.03. Concerning Deathfangs and Warlords, Amadseer (Chris Henson)
http://forum.arcanewonders.com/index.php?topic=13219.04. Concerning the Orcish Slave Trade and Priestesses, Amadseer (Chris Henson)
http://forum.arcanewonders.com/index.php?topic=13238.05. Concerning Necropian Vampires and the Bog Queen, Amadseer (Chris Henson)
http://forum.arcanewonders.com/index.php?topic=13286.06. Concerning Thorg and the Sunken Temple of Necropoli, Amadseer (Chris Henson)
http://forum.arcanewonders.com/index.php?topic=13362.07. Concerning Concerning Ichthellids and Catacombs, Amadseer (Chris Henson)
http://http://forum.arcanewonders.com/index.php?topic=15355.0Arraxia Rising1. ARRAXIA RISING: The Chamber of Embers, Sabrath_Kell (Chris Henson)
http://forum.arcanewonders.com/index.php?topic=15389.02. ARRAXIA RISING: The Circles of Fire, Sabrath_Kell (Chris Henson)
http://forum.arcanewonders.com/index.php?topic=15439.03. ARRAXIA RISING: A View From Infernia, Sabrath_Kell (Chris Henson)
http://forum.arcanewonders.com/index.php?topic=15478.04. ARRAXIA RISING: Strategy and Sectarus, Sabrath_Kell (Chris Henson)
http://forum.arcanewonders.com/index.php?topic=15560.0 5. ARRAXIA RISING: Understanding the Dark School of Magic, Sabrath_Kell (Chris Henson)
http://forum.arcanewonders.com/index.php?topic=15674.0Battle LinesPart 1:
http://forum.arcanewonders.com/index.php?topic=16828.0Part 2:
http://forum.arcanewonders.com/index.php?topic=16845.0Part 3:
http://forum.arcanewonders.com/index.php?topic=16864.0Part 4:
http://forum.arcanewonders.com/index.php?topic=16882.0Part 5:
http://forum.arcanewonders.com/index.php?topic=16893.0Hope this helps!