Rubies of Eventide (RoE or Rubies) is a free to play massively multiplayer online role-playing game published by Mnemosyne, LLC. Powered by the Lithtech Jupiter engine, Rubies of Eventide is set in the medieval fantasy world of Vormis represented by a 3D world. Rubies of Eventide is a free game funded by donations.

CyberWarrior, Inc. launched Rubies of Eventide on 2 June, 2003 as a paid service. Citing low subscription rates, CyberWarrior announced that the game would cease operations in December, 2003 but later managed to secure additional funding for some months. Later, two former CyberWarrior developers, together with the founder of the game, set up a private server to play the game with close friends and relatives, but found that some hardcore fans managed to hook themselves to their connection. After leasing the game to Mnemosyne, LLC. in 2004, the mmorpg continues to operate today on a donation-based model. Players are able to start and play accounts for free (with limited server space), while patrons gain priority in game access during peak usage, and certain in-game benefits. Mnemosyne, LLC., was founded by Julia Hiroko Howe in 2004 to manage and maintain the massively-multiplayer game "Rubies of Eventide." Mnemosyne also develops products for fans of genre entertainment including Tentacle Grape soda.

The game is currently hosted on two servers, each devoted to a particular play style: Pheonix, aimed at casual and newer players; and Fire Opals, dedicated to serious role-players. As of Spring 2009, the PvP and beta server Nemesis was taken off-line. Rubies of Eventide can be downloaded played for free although users are given the option to donate. A "patron account" gives some metagame benefits such as bypassing server caps and viewing player profiles. A "gentry account" also gives extra character slots, access to the "Founder`s Isle" and the player`s character receives three magic items: a ceremonial sword, teleport ring, and a Gentry Cloak, which all offer small boosts to your skills.

Rubies` unique combat mode is an asynchronous real-time turn-based hybrid combat. For players this means planning moves strategically with more attention to tactical planning than split-second decisions. This combat system combines turn-based and real-time elements. Under attack mode, every action has a preparation and recovery time, which varies depending on what action is taken (attack, movement), the weapon being wielded, and the strength of the user`s character. This way, the player can cancel its action when in preparation time (eg. cancel the attack and run away), but after the action is performed he has to wait until the recovery time is over (and for a few seconds he is vulnerable to his opponents).

Rubies of Eventide has a unique system for earning bonus experience points called the Risk/Reward system. The player decides how much he is willing to risk, or not risk.[8] Until level six, a player is not subject to risk / reward, and all of his items will safely remain in his inventory if he happens to die. Anything that he acquires after that, whether from trading, looting from creatures, or purchase from a merchant is automatically risked. If the player finds something that he does not want to lose he should pay a visit to the wardens to protect it. Any items that a player drops after he dies will remain on the ground where he died. The time they remain there for is determined by the player`s level. Please note that on Nemesis these items can be picked up by anyone at any time. The maximum risk bonus that any player can earn is 20%, he must have 100% of his total inventory risked in order to achieve a 20% risk bonus. If any items are placed in the vault, they will not count towards the risk bonus even if they are set as risked. Any items in the vault are safe, it is impossible to lose them if the player dies.