3/5 stars. The rules are average.
Background.
An infantry support platform designed to keep up with the foot slogging members of your army and provide powerful fire power. Enough to down blobs of enemy infantry and crack hard sieges, this engine in the fluff has it all at the expense of it not being a well armoured vehicle.
Strengths.
The Morbus Bombard gives you HE shells with S=9 and a slew is special rules including large blasts, ordnance on D, Barrage, breaching (at 6) and pinning. The Phosphex is S=5 with blast poisoned at 3+ and breaching (5+) with panic (3). Both are solid, but the phospex is shorter range with the valuable AP=3.
The graviton charge cannon is also S=9 with AP=3 which is valuable. Double damage shock and pinning are similarly great with heavy on D. It is reasonably good, but short range.
The spicula is much more interesting with a range of 72 inches combining with S=7 and a super large blast radius with barrage and suppressive.
Weaknesses.
The bombard is surprisingly sturdy with AV=13 on the front and 6 hull points which makes other rhino chassis based armour cry a little bit. You need to watch your positioning though in order to protect your rear. A marked improvement from second edition too, but I still prefer the Vindicator just about.
Builds.
Arquitor with Morbus Bombard (150 points)
I am tempted by the autocannon sponsons here to be very honest.
Arquitor with Graviton-Charge Cannon (165 points).
Not my favourite, but could be good.
Arquitor with Spicula Rocket System, Autocannon Sponsons (175 points).
Add search lights to taste. This is one you sit at the back field and fire all game long. Recommended more than others for sheer suppressive capability.

