It's a special ability exclusive to some Forestkin creatures (eg. Thornbark) and some buildings (eg. Living Tower) and it's used to boost each unit connected and afect in different ways each unit, for instance Thornbark will shoot faster. THe "Root" ability activate "Linked fire" wich is the capability to join or create root networks. 1. * Create a powerful defence line with Living Towers. 2. * Make death alleys with units like Thornbark or Spikeroot. 3. * A very useful way to create temporary bases.