If I were rank 6 zombie Fang Yuan
Fang Yuan came from Earth and transmigrated to Gu world and regressed. Mortals in Earth and mortals in Gu world are alike though we are more advance and civilized and our technology can wipe out cities and even countries when it comes to all out war with nukes.
If I were rank 6 zombie Fang Yuan with wisdom Gu on my side, I'd deduce and create a nuclear bomb with Gu world resources that can presumably can surpass our technology with hundreds of folds, especially that Gu world is far more abundant with plethora of minerals and materials.
Considering that southern border is stated to be 7-8 times the mass of the Earth, launching 100 enhanced nuke is enough to put the entire southern border into a turmoil and possibly annihilating it if I want to launch millions of nukes.
It does not require immortal essence, I can surely rule each region with our technology.
The only threat that can stand in my way are Rank 8 and the Venerables when it comes to fire power and destructive capabilities. That's a heaven defying feat as a rank 6 immortal zombie. (Theoretically)
Your thoughts?