The Harvester

The Eldar spat on the ground and glared up defiantly. The show of bravery vaguely amused Lord Eiterfex. Defiance was generally what happened when the enemy ran out of actual achievements to be proud of. 
"You think you have won, lackey of the Promordial Annihilator?" the xenos raged, struggling against the grip of the Plague Marine who held him more to show his unbrokenness than in an attempt at actual escape. 
"Well, my men are still standing and most of yours are dead," said Eiterfex cordially, "so I'm going with a yes on this one."
The Eldar didn't see the funny side and spat again. 
"Your vile feet may yet defile Eth-Athon, but with every drop of your blood we come closer to avenging Kurnous and wiping you from the universe!"
Eiterfex leaned over in his throne to Kallador Doomhark. 
"Which one's Kurnous?" he stage whispered. 
"Hunter god," growled Doomhark, glaring at the xenos, "this one's an Exodite."
Eiterfex grunted, and waved a hand to Brother Maladax. 
"Send in the Harvesters, Mal."
He stared steadily as the Eldar's face turned from hateful defiance to horrified astonishment as the awful, sawing buzz filled the air. dark, lumbering shapes passed overhead, and within moments the sound of shrieks came from behind. The Eldar struggled to see what was going on. 
"You're right, of course," Eiterfex said conversationally, "resources are the biggest problem we face. It's difficult to create a new son of Mortarion. That's why we need lots of spare bits and pieces."
The Eldar barely had time for the horror to sink in before a monstrous sting stabbed into his back, delivering him into a new world of horrors...

This was significantly easier to design than to execute, largely because of those wretched rotors! The starting point was a Dark Imperium Bloat Drone. Initially, I had the image of this being a vast, bloated monster, but on reflection I decided that a nasty, hooked wasp-like form would be better. So, I sawed off the back of the Bloat Drone, just behind the round metal bit, and then pinned the body of a Rot Fly onto the back. It looked rubbish! But that's usually the case at this point in the build. I used poly cement, waited until it ws firmly set and then went on.

Next up was the sting. This bit was easy. The sting itself is a spare Maggoth horn. I imply trimmed down the bottom of the Rot Fly's abdomen until the sting could fit smoothly then used poly cement to anchor it in place. I stopped at this point to do a bit of gap filling, and then moved on to the damn rotors.

I had the idea that there should be four rotors, principally because I hd four lying around but also because I wanted it t look bulkier than a regular Bloat Drone. There was no easy way to do this: the carapace of both the Bloat Drone and the Rot Fly are hatefully curved, which basically meant that it was a case of pinning the four rotors in place, drenching them in poly cement and then leaning the model at such an angle that on each side the rotors would more or less line up with each other. When this was finally one, I filled in the gaps.

Now, for its mouth I got aspare Maggoth mouth, trimmed down the back and glue it to the Bloat Drone just beneath the probe (I had to cut off some of the cabling for this) There was a lot of gapfilling after this, but eventually looked nice.

To finish up, I added four arms from a Dark Eldar Talos. I envision the Harvester slinking around the battlefield, stinging survivors to immobilise them, and then using those long, groping tendrils to scoop the still living supine forms into its vast maw, to boil in its guts until the Synod of Suffering can make use of the flesh...