Omicron v4 to a herc?

So I have the omicron rn and it's good and well but it doesn't really stand out to me as the best of the best. I'm looking to get rig like hits with my pen or as close as I can while still being able to keep it discrete and portable. The w9 talk is all very confusing and I still get confused on which coils and other accessories are compatible with what. So what I am asking is, what do I need to buy to have a so called "herc" set up. I already have an omicron if that is any help. Links would be nice. Thank you

-noob