I like the use of MW/Slow Fire to handle the Nova-Charge mode. That seems quite reasonable.
I'm thinking DC2 is probably appropriate, if not that, at the very least Reinforced Armor. These things are, by raw stats, about 3x as survivable as an entire squad of Terminators in 40k (same total wounds, same armor, optionally better invulnerable save, 3x harder to damage by most any AP weapons due to T6 vs T4, and more resilient to light AT weapons), and likewise much more resilient than a trio of Crisis suits (1 less wound, but 2x better save, invul save, T6 vs T4 again).
They also come with the option for Shielded Missile drones, which further up their firepower and survivability. In the new codex, they're also one of the few units which can easily get both Skyfire and Interceptor at the same time (Broadsides get one or the other, but not both, and Crisis suits can get both, but drop most of their weapons to do it), making them especially powerful against flyers. I think that should probably be represented somehow.
I think they should easily be on par with the Imperial Knights, which are DC1/DC2 War engines. It's roughly the same size and function as a Knight would be.
Something like this maybe:
XV104 RiptideWar Engine 30cm Movement, Tau Jet Packs FF 4+, CC 5+ Armor 4+ Reinforced Armor, Thick Rear Armor, Tau Deflector Field, Walker DC2, Critical Hit: Nova Reactor overload, unit explodes and is destoyed, does a hit to any unit within 5cm on a 6+.
Missile Barrage: 45cm 2x AP5/AT6/AA6 Ion Accelerator 45cm MW4, Slow Firing
Price: 125 pts for 1, 225 pts for 2, as a Support Formation
Combining all the Missile Pods from both the suit and Drones into a single profile makes it a different weapon from standard Missile Pods, which makes it easier to stomach adding the AA rating to represent the Riptide's usage as an anti-air support platform, when standard EA Tau Missile Pods don't get that. DC2 with 4+ RA makes it tougher than the DC1 Imperial Knights, but not quite as tough as the DC2 ones which have Void Shields. It's priced a little above the Warden, as it's less tough and has about the slightly less firepower, but it's more much manueverable and less vulnerable with the Tau Jet Pack rules. Compared to the DC1 Knights, it's obviously tougher and has slightly more firepower, while being somewhat more manueverable.
Looking at the Tau lists, this proposal is slightly cheaper, tougher, and has more firepower than the other DC2 war engine, the Orca, but isn't an aircraft nor a transport. Likewise it's cheaper than the Scorpionfish in the Armored Strike list, but has substantially less firepower and is only DC2 vs DC3, though it is somewhat more maneuverable.
Comparing a pair of Riptides to a team of 4 Crisis units, it's cheaper (225 vs 250), tougher (total 4 wounds on each side, but 4+ RA on a WE, plus Deflectors is better than 3+ with Invulnerable on INF), has more firepower at 45cm (4 x missiles are same, plus 1 IA attack per turn, average) and in FF (total 4 attacks at 4+ over total 4 at 5+). But it's got much less firepower in the 15-30cm bands (4x plasma and 4x fusion less).
This Riptide is a bit more expensive than a Skyray, and much more survivable, but not quite as good at AA, and is not embedded in a unit, cancelling out some of the survivability. That does open up the question of the possibility of allowing Riptides to be embedded in Crisis formations. My gut reaction is no.
I think that gives a nice niche for it. It's a reasonably tough all-arounder which can reasonably go after almost any unit in the game, even if there are other units which are better at each.
(edit to fix price in retrospect)
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