Currently, I'am going to try a mix of all these rules presented here. It isn't playtested yet.
When firing the Nova Cannon place it's template so that the entirety of the hole is within the Nova Cannons fire arc.
The Nova Cannon has a minimum range of 15cm: you must place the template so that the entirety of the hole is over 15cm away.
The Nova Cannon has a maximum range of 150cm: you must place the template so that the entirety of the hole is within 150cm.
Now roll the scatter dice and move the template the scatter distance in direction shown, including if a hit is rolled.
There are 3 range bands which affect the scatter distance.
15cm-45cm: 2 D6 scatter, take the lowest of the two scores.
45+cm-75cm: D6 scatter.
75+cm-150cm: 2 D6 scatter, take the highest of the two scores.
If you are on Lock-on special orders you may re-roll the scatter dice. If a hit is rolled on the re-roll, the shot does not scatter.
If the hole scatters over a stem or base, it causes D6 damage.
If any part of the template excluding the hole is over a base, it causes D3 damage
If any part of the template is over ordnance, the ordnance is destroyed.
If the template hits nothing place a blast marker under the hole.
You may test to brace against a nova cannon shot before the shot is fired (you detected the power surge of the firing sequence).
Holofields offer no save or effect.
Restriction: one Nova cannon per full 1000 points in the fleet.