Maelstrom is a live action role-playing game campaign run in the United Kingdom by Profound Decisions Ltd. The campaign consists of four events held each year at weekends during the British summer at a variety of locations. Although founded in 2004 - more than a decade later than Lorien Trust's Gathering campaign and nine years after Curious Pastimes' Renewal campaign - Maelstrom attracted 900 players to the last event of 2007, making it the second most attended fest LRP in the UK based on single event figures and the second largest based on overall annual participant count. The game is a "frock-coats and fantasy" campaign set in a pseudo-renaissance period, high fantasy landscape. It is a fest game, in which the majority of the action is provided by interactions between player groups rather than non-player characters and monsters. By contrast with the Gathering and Renewal fest campaigns, pre-arranged mass battles do not play a part in the events; what conflict there is generally player-driven and carried out between player groups.