Combat wise its offence is abysmal, with the lowest Strength (base 2, growth 0.2) and Magic (base 0, growth 0.4) in the game, but has incredible health (base 25, growth 1.5) and mana (base 50, growth 1.4). However, it can be useful if given the right skills. Giving it TransferMana can make it a useful mana battery, while any other skill that doesn't require base stats like Invigorate or Toxin can make it a robust support unit.
They can be sold for 300 gold at Medium size and for 900 gold at Enormous size. Every level above 1 additionally increases their price by 5%.