A gladiator and a hydra

Some concepts. We've since decided not to have any mythological creatures in the film now, but the hydra concept shows our line of thinking: if we were to have fantasy creatures they would have been very grim and visceral designs...not like typical fantasy but nasty and authentic feeling. Hence I based the hydra on crocodiles, triceratops and komodo dragons.

Now we have decided to hint at mythology instead. Thus, we have a gladiator in a minotaur helmet, three dogs on the same chain to represent cerberus the three-headed dog, and perhaps other such references.