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I was playing around with a special rule for Iron Warriors that involved once per game having a squad forgo their movement to have one model equipped with a Nuncio Vox call in an artillery strike. The weapons profile would be Unlimited Range Str 6 AP 4 Ordinance 1 Large blast and would always scatter the full distance despite the firers weapon skill.

Would this be over powered?

Well... if it's only once per game... then they do, in fact, tire...

Not overly so for Heresy-era gaming, if it's one blast per army per game I'd question whether the Iron Warriors' special rules would need a slight nerf to compensate.

How expensive should a one shot Artillery Strike be? 50 points?

Just compare with some allready avaliable stuff.

Black legion artifact.
s5 ap4, Heavy 1, Large blast, Haywire Maelstorm*, ignore cover, one-use.
*All buildings or vehicles automatically suffer d3 penetrating hits. Affected by bearer's bs.
it costs 75pts for piece of gear.

Now look at ig master of ordnance:
s9 ap3 ordnance barrage, large blast. Requires to remain stationary. Not one-use. But scatters 3d6 and 2d6 even when a hit is rolled, though is affected by bs. 30 pts for a model, the base one would probably cost 5-6 pts, so around 25 pts per upgrade.


I guess, s6 ap4 large blast ordnance that prohibits to move, scatters all the way and is one-use is worth around 20 pts. Even so, it will struggle to make the points back unless vs a horde or clustered up low-av vehicles which is rare. Make it barrage also.