Evil forces want a certain slave to die on the road but the blue warrior woman is there to protect him. The last one on the line is the one, he can see into spirit world and he may be a threat.
First time trying to use colours as symbols - the blue warrior is something with great, supernatural powers. The enemy is also out of this world but his colour is dirty yellow. (Really didn't want to use red, that's too often used to symbolize bad thing and so is black and green.) The humans are coloured with earth for they a bound to soil. They're walking in mud as the spirits are floating in air. Finally I inverted the colours to make this look more cool and well, different.