From the website:
Owing its origin to the lost knowledge of millennia, the Onager Dunecrawler is based on the Mars Universal Land Engine; itself inspired by the bad-tempered beasts of burden that transported their masters across Holy Terra in ancient times. The Onager Dunecrawler, rather than being a mere people-carrier, is absolutely brimming with advanced, powerful weaponry capable of reducing worlds to wastelands.
A light walking tank, the Onager Dunecrawler features four crab-like legs with optional armour plating. The armoured cabin and reactor are complemented by a huge variety of modelling options, with searchlights, smoke launchers, cognis manipulators and mindscanner probes; and the cupola can be modelled closed or open, featuring a Princeps wielding a heavy stubber. You get a massive amount of configuration and customisation available even before applying weaponry.
On the subject of weaponry, included in the box are four variants: an eradication beamer, twin phosphor blasters with sensors, a neutron laser featuring a coaxial cognis heavy stubber or an Icarus array - an awesome anti-air assault package comprising twin autocannons, a gatling flak launcher, an armour-piercing missile launcher and a radar dish.
Included with this 119-component multi-part plastic kit, making one Onager Dunecrawler, is a small Adeptus Mechanicus transfer sheet and a 130mm round base.
An enormous plasma weapon sitting atop a reinforced pillbox, the Plasma Obliterator is a magnificent piece of Adeptus Mechanicus war technology. The infantry assigned to operate this gun are known to hold their breath in terror every time it discharges, as the sheer power can destroy even the heaviest battle tanks and leave glowing, superheated craters in the hardiest terrain.
Available while stocks last, this is one of the most striking scenery models we’ve ever produced - guaranteed to impress anyone who sees it, and intimidate anyone going up against it. Combine it with the Aquila Strongpoint to create a massive, dramatically powerful piece of scenery that will be the perfect centrepiece of any hard-fought battlefield. Comprising thirty-two pieces, the kit includes rules for using the Plasma Obliterator in games of Warhammer 40,000.