Make a new Imperial supergun. Call it the Pwneratus Imperator. Sounds like about what you are looking for.
Actually, we are thinkering about that
![Wink ;)](http://www.specialist-arms.com/forum/Smileys/default/wink.gif)
Big lines of what we came up with, not playtested, not finished yet either.
- The nova cannon is a heavy long range artillerypiece using the normal guntable. One additional right column shift for firing over 60 cm.
- Make it an equivalent of FP6, roll to hit as normal, a hit doing D6 damage, shields 'absorbs' damage as normal. The multiple hits indicating its accuracy is better at short ranges but only one D6 is rolled for damage.
- no min range.
It's also possible we ditch the concept.