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I was thinking of using Chaos Possessed.
What has everyone else been thinking of using?
"When Blood Speaks, Shadows Answer."
I think that WHFB Chaos Marauders could make good bases for Wracks, they are cheap to buy (compared to many of your other options) should give you some spikes and trophies for their backs, are musclebound, especially in the upper body as the Wracks appear to be.
Just sculpt some robes onto the lower half of the model and try to find some cage-like facemasks for them to wear and you should have a fairly good base.
Personally though i'd wait a while before doing too much, we're rumored to get our second wave in about half a year, i'd be extremely surprised if they dont include Wracks.
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I've been using the old Grotesques as wracks for now but things get tricky when you need a model with a liquifier or need one to be an acothyst with an agoniser.
I was also planning on using the new mandrakes as wracks but now I have a list with both so that won't work either.
Possessed isn't bad, however they are a little larger and take up a lot of space on the board (with all their arms and stuff sticking out). Heck, I am using Chaos Terminators as Grotesques so I suppose it will all match up!
"On a hunch, I melted them down and inhaled the fumes and read the dark eldar codex again, AND FOUND A BUNCH OF NEW RULES HIDDEN BEHIND THE OTHER WORDS..." [Gardeth on modelling & interpreting the DE Codex]
Vampire Counts Zombies will work well too.
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I have used some Empire Flagellents from Fantasy for the bodies. They also come with some pretty good weapon bits and even a couple masked heads. Then I used other various bits (Daemonette claws, tyranid bits, etc) for other weapon bits.
I'm converting mine from some old Mandrake models I have lying around but that's more because I already have them than anything else. I just ordered these for my Haemonculi: Warmachine Cryx Cephalyx Overlords
But I saw these and they look like they'd make pretty awesome wracks: Cephalyx Drudge and Mindslaves
The meat things seek to destroy ourselves. They hunt us as we hunt them but they are weak and uncertain. Bring them understanding of the power of ourselves through our strength and their fear. The inferior flesh will be entirely destroyed, all fragments will be smashed. Ourselves will fight to the last, all weak flesh must be consumed
Those Cryx Cephalyx Overlords looks like very good Haemonculus alternatives, I might actually get some of them myself. They're dirt cheap as well, compared to GWs regular prices. The Mindslaves look terrible though, I would never put them on the table. I'd much rather convert the wracks from the mantic undead minis that i linked to in my previous post, especially the zombies look like they would make very nice wracks with a bit of converting done.
"I have seen you humans, trying to forge an Empire in the name of a corpse"