It was my understanding that you pay 1 qp no matter how many times you take Enhanced inititative. My reasoning being that quickness specifically states the cost per level while EI only says the one cost.
I was under that impression too, but I've heard differently so I'm looking for clarification.
Shockwave house rule seems okay, though for what you get it seems expensive.
It's more for thematics. A Mega-Strength 5/6 character punching the earth to cause a quake shouldn't be a small thing. The Earth trembles, the sky falls, The Devil starts banging a mop handle on the roof of Hell screaming at us mortals to "keep it down up there!".
Real next level biblical kinda shit.
A +6 difficulty quake would be something that was so brutal that no instruments could gauge it and most structures would fall flat. Do not pass go, do not collect shit cuz yo ass is homeless and waiting on FEMA.
Precision would be a good thing to go wit hit too... yeah...
_________________________
You will be shown
How I've become....
Indestructible.
Determination that is incorruptible.
Annihilation will be unavoidable.
Every broken enemy will know.
That their opponent had to be invincible.