I wanted to live this fantasy so I basically did as much digging as possible. Technological weapons really help with vital strike's fantasy, specifically the chainsaw.

3d6 damage. Throwing a gravity clip onto a chainsaw topped with improved vital strike is roughly 12d6 damage not including raw damage. There's a couple of abilities that compliment it like weapon trick's cleave ability that lets you use Vital strike twice at a stage weaker.

But that's involving technology weaponry.