Creating a nuclear explosion (the shroom)

Hey, I am completely new to Embergen and I have not found a tutorial on how to get the explosion right. I have seen the bombardement challenge, so I know that it is possible, but I cannot seem to get it right. I have tried a couple of things, e.g. shooting a fire torus up a fuel cone. Any ideas?

Many Tänks

I found the preset, and worked from there.