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 loota boy wrote:
Also, i would hope titans had a range farther than 10km. WWII battleships had guns that could fire some 15km, which is so far away that you can't even see the target because the earth's curvature comes into effect and blocks out anything past i think 12 km.

The distance to the horizon depends on the size of the planet your are on, for an average human on Earth the horizon is 4.5~5km away
Using a Horizon distance calculator a Reaver has line of sight up to 22km away, and an Imperator has around 44km line of sight (Further if what its shooting at is tall enough)

 ductvader wrote:
But Titans will almost always win the this robot versus that robot argument because we've never seen a universe that created that had even larger scale things than 40k.

You make me laugh