Is there any stats or info on these beasts? Did they ever appear in BFG?

Void Kraken are a tyranid vessel that was "Escort" size in BFG, but I know of no publications for the Void Whales or Void Carcaradon. I think that rules for Kraken might eventually be unveiled, but since Tyranids are not in full-on-assault mode on the Expanse they probably won't have rules in this setting for a while. I would just run them as narrative encounters rather than statted-out space battles.

There have been a few fan attempts to write these up - have a scout through Dark Reign and these forums, I seem to recall someone had a crack at rules for them a few weeks back.

I don't think all Void megafauna is necessarily Tyranid in origin. I seem to recall that in the old Spacefleet game, there were a few species of giant void-beastie that were said to have originally evolved independently of the Tyranids.

There seemed to be two broad types of bio-vessel:-

Tyranid Hiveships, which are conglomerate Tyranid entities, composed (one speculates) of hundreds of different creatures, all totally dependent upon each other. One beast might function as the drive engines, another as the sensors, another might generate heat and so on. There are probably also hundreds of creatures that form internal doors, digestive systems etc.

Kraken, which are true living creatures, a single evolved being. The Tyranid hivefleet uses these creatures, and it may be the case that they have created some of them, but it may also be the case that there are other types travelling through the void that are independent of the Tyranids. It may also be the case that the Tyranids have, in effect, hijacked some of these independent Kraken by use of specialist parasitic creatures that take over their higher brain functions.

I think Kraken are actually more interesting than hiveships...the idea that they had their own evolutionary history and role independent of the Tyranids is intriguing.

I seem to recall that the old spacefleet game had a few different types: www.solegends.com/citsfleet/tyranids.htm

I never actually owned any of the Spacefleet Tyranid vessels, but you can take a view on the size of each one from the pictures above:-

Deathburner: 2.25km

Ramsmiter: 2.1km

Hellblaster: 1.5km

Doomripper: 1.75km

You could probably also generate stats for them fairly easily based upon their purpose. The Deathburner probably plays a lot like a firestorm frigate, a ramsmiter like an Ork Brute Ram ship and so on.

Void whales are mentioned in lore and are not tyanid in origin. The size of a void whale is up for serious debate. In the new ork codex I believe it states that a void whale swalloed an ork fleet whole. Now did it swallow the ships whole one by one, or the whole fleet in one gulp is up for debate. Point is void whales are imense beyond any space craft made by the imperium.

This is taken from someone else post in one thread where i asked basically the same so REPOSTING >

I made a similar creature called the Novae Kraken which resides within the Unbeholden Reaches for my campaign. They are about a quarter the size of an Escort and travel in gaggles of four, which is the actual unit.

Novae Kraken: Large and powerful enough to engage full-sized starships, these creatures lie within the Unbeholden Reaches in scattered pockets where equally strange, yet smaller creatures known as Dust Clouds lie. Here, they hunt in large packs known as gaggles, chasing down the Dust Clouds for food in the cold recesses of space. They are naturally peaceful creatures, but with the colonisation of worlds within their hunting grounds, they are prone to viciously attacking merchant and smaller naval craft, most of which never survive. Those that do tell stories of the creatures' power and tenacity, capable of tearing through a ship's hull with relative ease. In recent months, these attacks have grown more and more frequent and it is whispered that some have become warp-tainted, those whom survive also claiming to see and hear things driving them mad.

Kraken Gaggle: The standard hunting group of these creatures, they travel in groups of three or four, each attacking its prey from different angles.

Speed: 8 Manoeuverability: +30

Detection: +25 Hull Integrity: 40

Armor: 10

*Hit and Run and Boarding actions may not be performed against gaggles.

*Instead of damaging components, critical hits against gaggles deal 1d5+2 damage to hull integrity.

Weapons

Claws and Teeth (4 strength, 1d10+3 damage, 5 critical Rating, 1 range): If to-hit roll succeeds by two or more degrees of success, the gaggle latches onto the hull of the ship and begins chewing and tearing through the hull, ignoring shields and armor. A successful shooting action using weapons on the part of the hull attacked can dislodge the gaggle, dealing 1d10 damage to it. Failed tests deal 2d10-4 damage to hull integrity each turn. If there are no weapons on that part of the ship, a macrobattery weapon on another part of the ship may attempt to dislodge it at -20 to hit.

Warp Taint: Once per gaggle per encounter, it may project an ominous aura of Warp energy, beffudling the crew. All tests during the ship's next turn suffer a -10 pentaly to all tests within 6 VU.

Dust Bombs (4 strength, 1d10+5 damage, 2 critical rating, 8 range); The gaggle hurl volatile balls of regurgitated nebula gasses at the ship. This weapon may ony be fired every three turns.

in one of the old WD BFG scenarios (or was it in the specialist games mag??) there was a special battle involving the Imperium (I think) and Eldar, but the Eldar had several Void Kraken that they had "summoned" to battle.

Now that would put an interesting slant on the run-in with Eldar pirates

DW