The Trollbloods are your protagonist faction of Hordes Mk2. Their warrior models make use of the Tough Ability and their Warbeasts can use the Regeneration Ability to heal themselves. Some of their warbeasts represent their worship of nature (Dhunia) due to their elemental natures. Their playstyle tends to rely on synergies between solos, units, and warbeasts.
One way to start Trollbloods is by buying the Warpack and playing small games using only the warlock and the three warbeasts that come with him.
What to Order

Contents
Chief Madrak Ironhide
Axer
Impaler Warbeast
Warpack Tactics
Beyond the Warpack