Tyrannocyte
The Tyrannocyte is a unit that fulfills the exact same purpose as a mycetic spore but coming WITH a model this time, released not long after the Maleceptor and Toxicrene kit and their accompanying White Dwarf rules. Even better than that, it's a drop pod that can MOVE (though rather slowly) and can fire FIVE Deathspitters (or Barbed Stranglers or Venom Cannons) at any nearby targets as long as they're within range/LOS. It's also improved by making it even more accessible, as now instead of only being a transport for certain models, it's now open to everything, limiting only to units of 20 models or one Monstrous Creature.
Course, though this sounds like every Nid Player's wet dream, the bigger score comes from the other models the kit can make: A spore mine that can hit flyers AND a living fortification that can fire five guns and a bunch of other fun rules to make area denial a thing without needing Gaunts everywhere.
Fluff[edit]
As for the Tyrannocyte's fluff, well it's basically a Mycetic Spore now that Mycetic Spores have been given the unperson treatment. Tyrannocytes serve as ship-to-surface transports. Though they appear to be merely spores, they are in fact creatures unto themselves, ejected from orbiting Hive Ships to slam into the planet's surface. After landing and disgorging its passengers it unravels a second, hidden flap of skin and fills it with helium-producing bacteria or whatever, and that's how it's able to move around. Occasionally the Hive Ships will fill it with Spore Mines instead and drop it as a special fortification/synapse signal booster. As such, they can be considered as the Bug version of the Dreadclaw Assault Pod.