My idea is, they arrive after so many monsters have been slain in one area. So, say someone is grinding in one area beating down weaker monsters left and right. These guys would appear for someone or a group to fight. They would range in strength the harder they are the more cracks the skulls have. Yes, the eye has a mouth hidden somewhere on it I can draw an in depth picture of it if you guys would like. Also sorry for the story blurb. I have way too much fun! ~ By posting my art here I acknowledge that developers of IridiumBased may use the material for their products. I am posting to give my creative support in aiding the development of their games. I by no means am demanding credit or compensation for my idea and art to IridiumBased. Finally by submitting these images I am stating that this is my own work, not the work of others.