to cast spells and heal damage. As the four factions in Hordes use no steamjacks, their functional parallel are Warbeasts, large savage creatures. The Warlock is able to "force" Warbeasts to perform special attacks, which builds up Fury points. The Warlock is then able to "leach" this Fury to add to his pool, otherwise the warbeast will continue to gather Fury, eventually losing control and going into an uncontrollable rage. This system has been dubbed "Risk Management" as opposed to the "Resource Management" system in Warmachine. The first rule book for the Hordes system is called Primal. It contains all the latest rules for the Hordes (and Warmachine) system, and army lists for the four 'factions' along with some Minions who will work for various armies. An expansion for the game called Evolution was released by Privateer Press in August 2007. A third expansion, Metamorphosis, was released in 2009. In 2010 a major rules revision, called MkII, was released following a similar revision for Warmachine. The current main rule book is called Primal MkII. It contained the latest rules and stats for a subset of the released figures for each faction. After this five Forces of Hordes books were released, one for each main faction and one for the Minions, each one containing stats for all released models for that faction and some new units. MkII saw its first expansion in December 2011 when the book Domination was released. In December 2016, Forces of Hordes: Trollbloods Command was released and featured all the current faction and profile rules for Trollblood models in Hordes Mk II. In addition, the rulebook also contained new troops to add to the fray, including an all-new Warlock. The sourcebook also contained an in-depth look at the history and structure of trollkin kriels. Hordes/Warmachine interaction From the beginning, Hordes was designed to be played against Warmachine. Playing a Warmachine army against a Hordes army is little different from playing two Hordes armies or two Warmachine armies against each other, and many of the special rules are written so that they affect models from both games in similar ways. As an example, damage is recorded differently for warbeasts (in branches) and warjacks (in columns), but most effects which let you choose a column to record damage against a warjack also let you choose a branch, and vice versa. However, each game does have models which possess special