As far as I know, the shaders only exist in 1.7+, and the monster has no eyes or body.quote]
Yes. This is true. I mentioned that shader so that you could look at it in 1.7 and understand what I was talking about. I'm just talking about an effect on the mob itself, but if it isnt possible, then whatever. (I have no idea what the limits of mob modeling/rendering are, so I don't know if what I suggest makes any sense) Thanks for responding! (Not many mod authors do that for me, even if it is just to tell me my ideas won't work.)
When you get a chance, maybe some custom attacks would be cool, along with that easy/hard mode option somebody mentioned earlier. Perhaps hard mode means that he has a specific place in the world where he can be summoned, like a big, dome shaped room where some ritual is done (I could think more on this if you wanted, but I doubt you will.) and the floor (The bottom bedrock layer) falls away, leaving you with just a few platforms/walkways. Killing it gets you the ability to escape.
Well, there's another round of random, incoherent thoughts. If you want, I can think up some cool ritual process and build the structure, even set up the fight and demonstrate it to you on video (It will take a while, school is a bit tough at the moment) if you think this is an idea you would proceed with. Note: This would be overworld only, the deep dark, etc. are its domain.
Some lore you could use (Not edited, but i'll get to it eventually):
The void monster, as it is called by those who have accepted its existence, is the guardian of the Lost Ways. The Lost Ways are passages travelable between worlds. The ways are dangerous for humans and other living beings, for the void that they are hidden within is a contantly moving area of space. People lost in its depths find themselves streched to impossible size, crushed down into the size of an atom. They almost always die.
But the wise ones long ago have found a way, the Way, to reach another world without death. Soon after, the resources from any world were for the taking, leaving some places drained of all life. The wise ones decided that they needed to guard the Ways from any unwary travellers seeking riches from other worlds. They created a creature, hungry and savage, from the negative energies in the void. It was known as nulla bestia, the void monster. The protector of the Ways.
I'll type more later, but for now its back to doing schoolwork... ugh.