The Mechanized Artillery is the promotional unit for Arena Challenge 2, introducing a new status effect ( Shell) and costing 75. It is quite powerful and resilient although its first 2 attacks are the most useful. It was re-released for one day on November 1st for 56 as part of the Breaking Into the Vault! sale.
The three LR-200 attacks are designed for slightly different purposes. The first attack is designed to demolish one resiliant enemy, such as a Mega Tank, or take down enemies scattered across the board. The second attack is designed to damage a small cluster of enemies, and does marginably lower shell damage than the first attack. The third attack is designed to hammer a large portion of the board, and does significantly more shell damage than the first two attacks. Going down the line, the attacks slice off chance of shell damage for increased splash damage, and therefore a wider area of units able to be effected by the DOT. Because the unstable shell attack does so much more damage than the other two attacks, its chance of shell damage is way lower than either of the other two attacks, at 25%.
The fourth Box Laucher attack is the weak link. It fires four rockets randomly across the same attack shape as the explosive shell attack. The rockets all do a minimal amount of damage. Most often, three rockets hit the center square and one hits an adjacent square. This attack might see use during the long 7-turn reload time of the LR-200.
Lead the way, young Zoey! Field work is so exciting!
Test the new Mechanized Artillery
Reward:
400
Dialogue
Start mission
I've finally done it, Floyd. This new ammo is sure to change everythin'!
Hmm, the cartridge load seems somewhat unstable, Zoey. Not that I don't share in your enthusiasm for the potential here, but I think some testing might be in order before we make such bold claims.
Well, not every shot is gonna cause small mushroom clouds on the battlefield, but when this thing works… just don't stand near your target. Still, havin' a quick test's a good idea.
Finish mission
Well, that was entertaining and educational! Like you said, not every round causes maximum devastation, but when it hits, it REALLY does a number on the target area!
Yep! Pretty much obliteratin' anythin' in its path! And we haven't even tested the 'Unstable Round' yet!
Reward screen
Perhaps we should move that test a bit further from the Outpost...
Trivia[]
Even though there are six rockets visible in the rocket pod, only four do damage.
Although it appears there are four cartridges in Mech. Artillery's back, they are never loaded into the cannon.
The tip of the cannon resembles Ramsey's minigun, and even rotates just like his when it fires.
Plague
Shell
Stun
450
80%
65%
90%
60%
55%
250
75. It is quite powerful and resilient although its first 2 attacks are the most useful. It was re-released for one day on November 1st for 
3
SP
Total
Bravery
Defense
Dodge
Ability Slot
4h
7,632
1,000
4
2,000
10
1,000
