Osuology

Ok, thanks guys. I'll look through some forge events and see how to do it tomorrow. Thanks!

Well, the problem is that I am not only changing AI. I'm also changing their attributes and AI that can't be changed. (Such as the skeleton burning in daylight)

So how would I go about replacing the default mobs with replacements that have have what I want? I'm fairly new to modding (but not coding)

Well it was my whole idea to modify the default minecraft experience. Essentially, it's adding a fourth difficulty to minecraft: Insane. And of course, I need to change attributes of mobs and AI etc. If forge doesn't support it, why does it work when I launch through eclipse?

Well, I made some modifications to the default files, by using the same package names in my mod as the default packages. It works fine when I launch MC through eclipse, but when I build my mod and put it in a normal minecraft environment, it doesn't work. Everything that isn't a net.minecraft package is loaded, and MC doesn't crash or fail. Any ideas?