Some thoughts on possible spells and abilities:
Pillar of Shadows: lasts until the end of the following turn.
(a psychic power much akin to the old Space Wolf Rune-priest power Storm Caller, as well as the new Tyranid Venomthrope's ability to create a concealing cloud of spores.)
The Nano-vamp summons a swirling maelstrom of Warp-shadow to conceal himself, and those close to him. this would allow a 4+ cover save in the opposing player's shooting phase, to all models underneath the Large Blast marker, which would be centered on the caster. if the caster or affected models then charge into assault, or are assaulted in the subsequent turn, he and all friendly models under the large blast template act as if fighting from cover. Enemies engaged in combat under the template must make an initiative check (6's always fail) or fight at -1WS.
This power may seem a little over the top, but keep in mind it's near twin did once exist for the space-wolves, and my guess is that the majority of our army will not be toughened bad boys with 3+ armor saves, so this may well be essential for a close-combat oriented army with unexceptional armor saves on the majority of it's units.
Once per Game in the owning player's shooting phase, the Nano-vamp may make the following attack:
Nano Swarm. Range: Flame Template. strength:X. AP1,(invulnerable saves apply)
assault 1/template.
(there is no strength, because models hit by the attack must make a toughness test(6's autofail), or immediately suffer instant death, and be replaced by a nanozombie/larger beastie(depending on the number of wounds on the unit's base stats). this attack does not work on everything, obviously. vehicles suffer a S8 melta-hit(2d6 penetration), and monstrous creatures who fail their toughness tests, (and any invulnerables that they may have,) "only" suffer D3 wounds.
This, too, sounds crazy, but i love the odd, one-off, ace in the hole spell that has the potential to turn games around!
also, what do you guys think of this for the Nanovamp HQ Base stats, and what would his points cost be?
WS7, BS5, S5, T5, W3, I8, A4, LD10,
Wargear: power armor, frag&krak grenades, power weapon and bolt pistol.
wargear options: artificier upgrade, master crafted weapon option, jump pack, bike,
choice of guns: storm bolter, combi-bolter, plasma pistol, hand-flamer.
CCWeapon options: Force weapon upgrade, lightning claw(s),Power Fist, or, the (VERY points costly) Nano-blade!!! this is a weapon that essentially counts as a +1strength force weapon, 2d6 vehicle penetration, re-roll to wound, and models killed by it (aside from monstrous creatures, vehicles, and some races discussed in a minute)
are turned into nano-creatures of some kind. perhaps 1 wound troops will get turned into nanozombies, and anything with 2+ wounds will turn into a slightly larger 2 wound nasty.
The Races that i would see being immune, or susceptible to the Nanite madness:
Tau. they have no warp potential, so to the nanites, their blood holds no sustenance whatsoever. thus the nanites cannot thrive within them!
Necrons: umm, they don't have blood. the nanites are like ROfL, WtF?
(I promise to refrain from l33tsp33k from here on out! hehe)
Orks: they may not seem so, but the orcs are somewhat psychic. their technology doesn't work in the hands of any other race, and their orky logic tends to slightly Warp the universe. (red trukks, anybody?) so i'd say the Nanites could eat/possess them just fine.
Tyranids: Hmm not sure. any suggestions? part of me say's they're fair game, the foul ichor within them holds plenty of Hive-mind Warpy goodness, but then again i think the hive mind would probably rebel, fighting to regain control of it's P(r)awns.
Mankind: all good, except for Possessed human Daemonhosts, and space marines heightened bodily defences would probably reject it, especially followers of Khorne. he's the Ever-Thirsting-BloodGod, and any little pesky bots trying to Mack on his proverbial Cheese-fries would probably get boiled, or zapped in some fashion. Also, if they tried to possess Obliterators, they would probably find some pretty hostile Daemonic nano-machines already in residence.
Eldar: Yummy.
Dark Eldar: A little greasy, but same as Eldar.
Daemons: Nope! true, the nanites like warp-energy, but it's in a similar way that fishes like Oxygen. it needs to be diffused within water/blood, for the fish/nanite to gain what they need. a nanite in pure warp energy is like a fish on land; plenty of the right stuff, but no way to harvest it. the nanites would simply overload and sizzle.
up next, probably some vampyric trait-esque options. I want them to be Uber, but i'm thinking, for fairness and simplicity, the Rules should be to only be able to take one or two.
peace for now!