Disclaimer:
Just so we're totally clear here. this list isnt written by, or in any way endorsed by Dave (or, presumably Zombocom or Arkturas, although i did pilfer heavily from his older Draconis lists in the making of this list, so i hope he likes it.)
If you want to make a proper tyranid assault list, this isnt the list to use (for one thing, there is nothing smaller than a carnifex in the list) I suggest you take a look at either the V10, or Leviathan v3 Lists for your regular bug-related needs.
If, however, you want big stompy bugs, roaring like godzilla and stepping on top of tanks and such, hopefully i have the list for you.
Enough Preamble. Onto the good stuff!
Splinter Fleet RusalkaLittle information exists in the Inquisitional Archives of what occurred on the panet Typhon, and what does is largely discredited. Typhon, part of the subsystem of space known as the Barrier Worlds, was a largely water based fortress planet. What land mass existed consisting nearly entirely of heavily reinforced walls and cliff faces (to survive the incredibly harsh winds which had been known to strip a man to his bones in under an hour of exposure.)
The planet itself lacked a significant Imperial population, and while the sea was considered quite fertile, the weather made harvesting its resources to be too risky to attempt at any large scale. As such, the planet was used primarily as a munitorium substation and weapons testing facility.
Late m41y954 the planet simply fell silent. nNo communication for over a sidereal year, until one message, a frantic cry, repeating itself over and over until it as cut short. Rusalka.
RusalkaIt took some time before a party could be mustered to investigate, and upon arriving, the planet was found to be deserted. The oceans, once filled with life where now empty. The walls and bunkers, cracked open and eroded away by the winds. Very little sign of human existance was left upon the planet, and no lifeforms of any kind could be detected. the survey team was baffled.
Inquisitional elements began an investigation to no great success. One journal was uncovered, bady damaged, filled with ravings of monsters from the sea. Some of these descriptions were eerily close to descriptions known to the ordo xenos, descriptions of some of the heaviest organisms observed operating in Tyranid Hive Fleets. But these creatures, if they had really existed at all, where nowhere to be found, and more troublingly if the accounts where to be believed, represented the smallest elements of the menagerie of horrors unleashed upon the world.
Lacking any evidence to back up these theories, the Inquisition decreed the world to be a dead planet, and sequestered the journal and its contents away from prying eyes. Surely if the Tyranid menace had indeed spawned such horrors, they would have heard of them upon other battlefields. It was considered a coincidence, nothing more. Some exceptionally potent virus was most likely the cause of the sudden lack of life upon the planet, something that wiped out everything and burnt itself out without trace. The Journal, and the message where discredited as the fevered ravings, the name Rusalka being from local folklore of a kind of vampiric water spirit. A rogue virus was declared the cause, and after scouring the planet for two years with no success, Typhon was sealed away and abandoned.



(Note: Upgrades can only be taken only by warengines (for now, buggerit, even trygons, but i wouldnt bother if i where you)
Notes on new units: the objective here is to provide easily proxiable/convertable variety for the hive fleet, and allow an easily acquirable army from the current 40k range. as such, the new creatures are designed to be based on the following 40k figures:
Malanthrax, Tyrant Guard.
Hierophage, Pyrovore (or Biovore, current model is hideous, but the previous one isnt bad)
Viragon, Ravener.
Hierarch, Carnifex.
Heavy Spore Clusters, Spore Mines (duh)
i've also made spore chimneys (made from tyranid weaponry sticking out of the ground) to provide some cool AA options. i'm a little concerned by their stats, but i think they're a good baseline to work from.
Note on list selection: to limit the "mass of cheap titans" problem (already limited due to the costs of the titans involved at this point, we can have a 3200 point formation, or hilariously, a combined assault of 8900 points!) i've only allowed Hierodules (as a note, i mean oldschool hierodules, not the new ones. if i must, i'll rename them Hierophant and Hydraphant, i'd just prefer not to. i may also, if there seems cause for it, bring in the current scythed and barbed hierodules) to be taken as Packs of 2, or as support formations. this means that the cheapest core formation is 500 points, and thus, the most titans likely to be present in a 3k list is 6. if anything, i suspect i've made things too expensive, but i'd much rather err on the side of caution here. they are fierce, if very limited in scope
Aggressive Expansion seems like a very fluffy rule, if you can confine it to their side of the table you should win. that is how one fights tyranids in the fluff after all, you never actually win, you just slow them down long enough to escape or bring in mass backup. (as a sidenote, this currently includes the spore chimneys, which cant make it to the other side of the table regardless)
my current greatest concern is probably the possibility of Adrenal Glands on Viragons
i am also a little concerned about the balance between the hierophant and malanthrax. but hopefully the roles are sufficiently different that the two are able to find different niches (honestly, i suspect that the malanthrax will be a poor choice given its incredibly limited engagement range. once its used its adrenal glands (i assume everyone will be taking these on all their CC titans) it's pretty easy to stay outside of 20cm and just ignore its rampaging
seperate note: i've allowed multiple Hierarchs, because i dont really like 0-1 restrictions. I dont imagine it will be a popular choice in normal sized games, but it is worth noting that it does allow multiple supreme commanders in the army. for now, i'm happy to simply allow it and see if it becomes a problem (as 1+ activations, they're not often going to need to use the reroll, let alone twice (that being said, i did yesterday, it probably would have saved me the game, when my 1375 point biotitan failed to assault the mass of marines nearby, and was subsequently killed)
overall, the list seems to function pretty much as intended, though i suspect that imperial guard and eldar armies will butcher it, while ork and other nid armies may struggle to find a purchase against it (except the gargant bigmob list, which will probably tear each other apart in a glorious kaiju battle leaving a megagargant standing victorious over the ruins fof tokyo)