Defense of the Ancients or known as DotA is a custom scenario for the real-time strategy video game Warcraft III: Reign of Chaos and its expansion, Warcraft III: The Frozen Throne, based on the "Aeon of Strife" map for StarCraft.
The scenario was developed with the "World Editor" of Warcraft III: Reign of Chaos, and was updated upon the release of the expansion, The Frozen Throne. There have been many variations of the original concept; the most popular is DotA Allstars, which has been maintained by several authors during development. The current developer is known by his pseudonym as "IceFrog".
DotA - Defense of the Ancients pits two teams of players against each other: the Sentinel and the Scourge. Players on the Sentinel team are based at the southwest corner of the map, and those on the Scourge team are based at the northeast corner. Each base is defended by towers and waves of units which guard the main paths leading to their base. In the center of each base is the "Ancient", a building that must be destroyed to win the game.
In June 2008, Michael Walbridge, writing for Gamasutra, stated that DotA "is likely the most popular and most-discussed free, non-supported game mod in the world". In pointing to the strong community built around the game, Walbridge stated that DotA shows it is much easier for a community game to be maintained by the community, and this is one of the maps' greatest strengths. Defense of the Ancients has been credited as one of the influences for the 2009 Gas Powered Games title Demigod, with the video game publication GameSpy noting the game's premise revolved around aspiring gods "DotA in real life". Guinsoo went on to apply many of the mechanics and lessons he learned from Defense of the Ancients to the upcoming Riot Games title League of Legends: Clash of Fates. Other "DotA clones" include S2 Games' Heroes of Newerth.