"Asheron's Call" (AC) was a fantasy massively multiplayer online role-playing game (MMORPG) for Microsoft Windows PCs, developed and published by Turbine Entertainment Software. Though it was developed by the Turbine team (with Microsoft's extensive assistance), it was published as a Microsoft title until 2004. The game was set on the island continent of Dereth and several surrounding smaller islands and archipelagos on the fictional planet of Auberean. The game was played in a large seamless 3D virtual world which could host thousands of players' characters (or avatars) at a time.