Warhammer Online: Age of Reckoning (officially abbreviated as WAR) is a massively multiplayer online role-playing game based on Games Workshop`s Warhammer Fantasy setting. It was developed by Mythic Entertainment and simultaneously released in North and South Americas, Europe, Asia, Australia and New Zealand on September 18, 2008. The game revolves around the continual worldwide conflict that the Warhammer Fantasy setting is known for, and the game is geared toward ongoing, constant war laced with dark humour.

Warhammer Online: Age of Reckoning is a Realm versus Realm (RvR) game with two factions: Order and Destruction. Each faction contains three separate armies, each of which is further broken down into four career choices. Some careers are gender specific i.e. only playable as a male or female character.

Each of the twenty-four careers in Warhammer Online conform to an archetype role, though not as strictly as in many other games. For example, the Warrior Priest is an archetypal support or healer career, though he also has many melee DPS elements, meaning players of this career will have to enter combat and fight to be able to heal their allies effectively. In this way, the careers are given variety and avoid being simple reiterations of common fantasy archetypes. There are specialization within careers, based on career mastery lines in which Mastery Points can be spent. This allows for more variation between characters of the same career. Most careers have the option to play as either a male or female character. However, some careers such as the Witch Elf are only able to be played as one gender (female, in this case). By contrast, the Greenskins (Orcs and Goblins) are genderless, though masculine in appearance.

In Warhammer Online character customization is available in many forms. The initial character creation process allows players to select the race, career and basic look of their character, including facial features and accessories. In addition to the original name that the player chooses for their character at creation, the player has the option to add a surname to their character for a small fee at rank 20. Surnames are received from the naming commissioner in Altdorf, for Order, and The Inevitable City, for Destruction. Dye is available at NPC vendors for recoloring armor and accessories. Players are able to decorate themselves with trophies, such as the heads of fallen enemies, which are equipped and displayed at various points on the character model. Other forms of customization include Tactics (customizable sets of bonuses that players can adjust while out of combat), as well as Morale Abilities (increasingly powerful abilities that become available as morale is generated during the course of battle). Customizable armor and visual guild heraldry also aid in allowing a player to make their character visually unique.

Warhammer Online: Age of Reckoning- Wrath of the Bright Wizards features Mythic`s Realm versus Realm (RvR) combat system, originally developed in Dark Age of Camelot. This takes place within three different racial pairings: Dwarfs vs. Greenskins, Empire vs. Chaos, and High Elves vs. Dark Elves. Although there are only two races per pairing, players may travel to either of the other two pairings to help fight with their friends and allies. There are four types of RvR combat: Skirmishes (random world encounters), Battlefields (objective-driven battles in RvR-specific areas), Scenarios (instanced, point-based battles against the opposing faction), and Campaigns (invading enemy lands and capital cities). RvR contribution includes both Player vs. Player (PvP) combat and (to a lesser extent) Player vs. Environment (PvE) quests so that you can assist your realm in their victory, regardless of preferred play-style. All activities in WAR contribute to the campaign, as it is the primary focus of the game. Each of the aforementioned activities generate Victory Points (VP) which measure a realm`s progress in capturing a zone. When one realm reaches a designated amount of Victory Points in a particular zone, that zone falls under their control and the war pushes deeper into enemy territory. This back and forth struggle for zone control continues until one side holds two racial pairings, and the attacking side may sack, loot, and pillage the enemy`s capital city. The capture of a capital city is the pinnacle objective of the campaign. Once a capital city is taken, the attackers are given a period time to loot the city. When this period expires, the defeated players receive increasing support from NPC guards until they are able to force the attackers out of their city and close the gates. At this point the campaign then begins anew, restarting the cycle.