Did anybody tried to bind greater daemon into voidship? If yes, what was your ruling about it? what benefits, drawbacks?

This is mostly nothing, but I seem to recall, from back when I looked through BFG pdfs, that "Daemons ships" from that game could "phase in and out". You could still see them, but they weren't entirely there, and neither could you, or they, do anything to the other. In this way, they could circumvent weapons of greater range than themselves, and solidify when they were where they wanted to be. Also, if things went south, they could phase again.

I've never played Battlefleet Gothic, so I hope I'm not getting that to wrong, and that game might be more about just throwing fleets at one another, rather than tactical withdrawals, but if your ship could do that, it could, potentially, survive a great deal of player min-max spam, and get into advantageous positions, do what it needed to, and then not get shattered to bits. For balance, you might say it can't move, attack, or whatever, during the Strategic Turn it is phasing, or solidifying, so there might be a turn, here or there, where it will need to absorb a pounding, but it could certainly have its options. Even durable Ork ships, well known for having tons of extra junk, and still "functioning" after taking lots of damage, can still be hosed in Rogue Trader space combat, especially if the players have had ample time to twink their ships, and crew/PCs, while the NPC ships might feel more "stock", and can't all be "equally pimped to you", or what was the point in you pimping?

It's something I vaguely remember, anyway, and some old-school BFG players might come along and say "you got that all wrong ;)", but it's a thought.

Another thought, I might like, would be maybe a bit more "Nurgle" than blank Chaos, but a hull that either slowly regenerates, or mechanically reduces damage from attacks. Nurgle is hardy, resilient, and able to absorb considerable punishment, so his ships might be able to shrug off "typical" attacks, better than the rest. At one point, I intended to build a Nurgle ship with some such hull plating, a "plague cloud" that hid it, akin to Eldar holo-fields (the healing hull offsets the risk somewhat), and also virus warhead torpedoes, and possibly a few boarding torpedoes (liked that idea more for Orks, who want to get in it, but anything to spread the plague along, I suppose, and better if it was Plague Marines crew, rather than Cultists, but Space Marines...sometimes that's another advantage they don't need). In the end, I suppose it depends on what you want, need, and what "Chaos" you envision.

A Daemon-possessed voidship would be quite a daunting task to create, not to mention finding powerful daemons in sufficient numbers to even animate such a massive structure. I can imagine the populations of entire cities needed for such a binding ritual among hundreds if not thousands of individual sorcerers or occultists to actually perform it. Once completed though, it would be a massive threat to anything it encountered within its weight class and even beyond. The actual benefits and drawbacks would need to be tailored to the daemons actually inhabiting it, as is the case with Daemon weapons, but some of the ones I would expect out of hand would be:

• Self-repair over time The hull could simply regrow and damaged components reforge themselves akin to a living creature mending its wounds over time
• Increased damage from weapons As is the case with weapons the daemons possessing the ship would imbue its weapons with their own rage and power, increasing their effectiveness (I could imagine an increase of 1 or 2 in Damage and Strength)
• Vastly increased Warp speed As a ship that is partly made of warp matter and guided by beings that are of that realm it would be able to bypass most warp routes and simply travel through the Immaterium as a fish through the ocean
• Hellish interior design Daemons warp and alter whatever vessel contains them and a ship would be no exception, as such I would expect the interior to become almost unrecognisable with fleshy growths, crazed layouts, shifting rooms, etc. Not to mention the daemonic presence could provide a layer of defense within the vessel in the form of pitfalls, walls that eat intruders (or crew), pools of lava or acid, etc.
• Rampant mutation among crew Simply being aboard such a vessel would cause any crew to be exposed to maddening amounts of warp energy that would twist their minds and warp their bodies over time. I expect a daemon ships crew to be less than human for the most part, little more than slavering beasts that stalk the halls no longer needing sustenance as the warp energy of the ship itself fuels them

Hmm... From BFG initial reading, I got that they have that phase in and out ability which is itself nice. There are even 4 marks of chaos which might be comverted easily.

MarkofSlaanesh ............+25pts

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From what I remember of Daemon ships, It might not necessarily be made up of a group of daemon's but instead might be one powerful one or even one that somehow possessed and thereafter corrupted/mutated the vessel itself. (I actually had something like this in one of my games!) The fluff mentions that the daemons that most inquisitors are familiar with are hardly the largest or most powerful things in the warp! Also remember; size is yet another scientific reality that has no real meaning in the warp. Without the Gellar field, your ship could be smaller than the size of a pin or larger than a planet! Only when you return to realspace does the mass of the vessel factor into how things affect it!

Here is an Image from Battlefleet gothic. Hope it helps!

OH. I found "The eye of the Abyss" Daemonship in Dark Heresy Creatures Anathema. It explains roughly its ability to phase in/out.

In the second Grey Knights novel there is mention of both Daemonships and of binding Daemons into ship systems to serve as a controlling/directing force. IMHO, any Chaos fleet worth it's salt will have at least one Daemonship. I would imagine that the pacts required to achieve such a thing would be extremely damning... but the value of having a ship with such power might justify the cost. A Khornate-aligned slaughter cruiser with daemonicly powered lances, and engines, that can blink in and out of reality and is crewed by khornate daemons? maybe even captained by a super powerful greater daemon or daemon prince that goes around capturing and killing as many as possible to feed the sacrifices that drive the ship when it is not in the warp? I think that is sufficiently metal for the warhammer universe. Good luck getting it to follow your commands though...

I'm not entirely sure how many daemons I think it would take to pull off the stunt. If the daemon controlled a system that directs many apparatus, such as the guidance system, every few feet of the ship won't need an additional daemon, and the Eldar perform a similar feat with their dead. Many Eldar ships, I believe, use a small number of spirit stones, to offset the smaller crews Eldar ships might be required to maintain, but even a full on wraithship, I don't know how many actual Eldar souls it takes, and some daemons would equivilate up to several handfuls. Between strength of the fiend, and strategic possession, it might not be too bad a trick; still ridiculous, and might take lots of work, and resources, but not SO bad...