Eris Online is a browser-based dark fantasy MMORPG from Stone Carter Studios LLC, set in the domain of Eris, the goddess of strife and discord. Designed as a persistent sandbox, the game centers on player-driven politics, territorial conflict, and open-world PvP, where players can capture resources, siege cities, and battle for control of valuable areas.

Character creation offers 10 races, four base classes, and 20 advanced classes, with traits and specializations enabling extensive customization. Players can also build homes, workshops, magic shops, and cities, which are closely connected to gameplay, equipment, and skills. The world supports resource production through hired workers, while player shops, taxes, building upgrades, and item quality add further economic and strategic systems. Recent profession additions include the subscriber-only Necromancer and Sellsword.

Eris Online is free to play and states that it has no cash shop or pay-to-win features. Optional subscriptions start at $1 per month and provide early access to preview content and additional character slots.