The shaman sends his mind winging into the wilds and possesses the largest creature he can find, storming back onto the battlefield with a vengeance.
Source: Warhammer Fantasy: 7th Edition
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The shaman may summon one of the following beasts: Jabberslythe, Giant or Ghorgon. Immediately place a model representing the beast, with its base touching any table edge. This model is effectively part of the Beastman army from that moment on. While the shaman controls the beast, he may not cast or dispel any spells, or make attacks in close combat. Every time the beast suffers a wound, the shaman that summoned it must make a Toughness test. If this is failed, the Bray-Shaman takes a wound too, with no saves of any kind possible. If the shaman is killed, the beast wanders bach into the forest and is immediately removed from play (it counts as being killed for the purposes of victory conditions etc.). Note that the beast cannot be voluntarily dismissed by the shaman, or dispelled by the enemy in following rounds.