So, I saw the image below, and decided that I needed to turn it up to eleven.
Anyway, I decided to create a rule set for a Tyranid Version of Rayquaza. I'm still trying to figure out the points cost, but I've got a few points.
1) It must be immune to the Long-barreled burst cannons on a Tau Manta. Because seriously, Warp take those things.
2) I want to keep the points below 750, but I'm more flexible on this one.
These are my stats so far. This is more of a dump of ideas than a coherent stat block, so don't expect the final version to include anywhere near all the stuff here.
WS 3 BS5 S8 T (Problem. 8ish, maybe) W (A bunch) I 5 A 2
Ld 10
Sv 2+ or 3+
UNIT TYPE: Flying Monstrous Creature or Flying Gargantuan Creature
UNIT COMPOSITION: 1 Nidquaza
WEAPONS AND BIOMORPHS:
• 1 Bio-Plasma Accelerator (S9-10 Assault 3)
• 8 Venom Cannons
• Mega talons (+1 Vector Strike Attack)
• Bio-Forcefield (Givens an Invulnerable Save and reduces the strength of Incoming attacks or something)
SPECIAL RULES:
• Synapse Creature?
• Eternal Warrior
Probably a better idea would be making it a vehicle somehow, but I'm not sure how to square this with the fluff. Given that what I have in mind involves the Characters discovering it in the collection of a Necron Lord, it could be infused with Necrodermis somehow, but this might mess up some other things I have in mind.