I'm wondering... How does the EnderDragon emit light beams when it dies? Is there a way I can use these light beams to my advantage in my mod?

I suggest you check enderdragon class out, probably in a onDeath() method or something like that

 

if (this.health <= 0)

        {

            var1 = (this.rand.nextFloat() - 0.5F) * 8.0F;

            var26 = (this.rand.nextFloat() - 0.5F) * 4.0F;

            var3 = (this.rand.nextFloat() - 0.5F) * 8.0F;

            this.worldObj.spawnParticle("largeexplode", this.posX + (double)var1, this.posY + 2.0D + (double)var26, this.posZ + (double)var3, 0.0D, 0.0D, 0.0D);

        }

 

thats what I found in EntityDragon

Hmm that didn't help much. That part of the code has nothing related to the rendering of the light beams. I'm trying to achieve an effect like in Thaumcraft's Singularity ball explosion thing where it uses the ender dragon dying light beam effects...

 

EDIT: Found it. RenderDragon.