Cthulhu mod project I am working on

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Check out the video, it shows what I got done so far! I'm still going to change a lot of stuff on this fight, which is the main fight on the mod. But anyways, any ideas for the fight/boss?

I know I tease a lot of stuff, but this one is actually going to happen. I had some personal life problems, but now I'm back. Yes, I do plan to release the other mods I have teased before, such as the Skaven and the zombies (though that one needs a lot of work yet, I have an idea for it). I also got a new creature to release. Tsaesci, which I was making some time ago, but then I stopped after seeing that some other guy released a Tsaesci playable race .-. Anyways, now I'm working on this Cthulhu mod. Because I and everyone loves Cthulhu.