Models for this seminar are adapted from:

http://opengameart.org/content/animated-cerberus
http://opengameart.org/content/animated-mage
http://opengameart.org/content/animated-knight-walk-edit
http://www.blendswap.com/3D-models/animals/truncano-rigged/

Adapted by Michalis Kamburelis to have group + empty driver + consistent
naming etc.