Sorry, I didnt mean daemonhost as in those that are used by the radical inquisitors; I meant it as in a host of daemons, i.e. the formation of lesser daemons!  

Too cool to use Warmaster Harpies?

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Fear is for the enemy, fear and bullets.
-James O'Barr, the Crow

The decision to limit the list to existing models is a very limiting one. Furies and other such units are certainly part of the daemonic pantheon these days, and you'd really have to go a long way to say that a unit isn't possible to find a proxy.

I would recommend to design the list - especially at this brainstorming stage - with everything it should have. If there's anything that is flat out impossible to find a model for, then maybe consider dropping it later. By resolutely refusing to consider anything without an existing model really limits the list for those who WOULD like to convert or scratch build stuff.

One thing I was thinking of is daemonic chariots (possibly again drawing on the warmaster range?)

Anyway, soulgrinders:
"[Soul Grinders] are the fusion of the most powerful of daemonic entities with machines of war that originate from outside the Immaterium, but have already felt the touch of Chaos. These are often the wrecked remains of great Daemon engines and other possessed vehicles, like the mighty Battle Titans of the Legio Mortis, or the rampaging Defilers created by the Traitor Legions."

So basically, any War Engine in the BL or LATD list is fair game as the basis for a Daemonic version, in particular the titans and daemon engines.

I actually think Greater Daemons should just have one statline and I would leave the role of giant-war-machine titan things to these soul grinder constructs.

I for one really dislike army lists where I have to either proxy 3/4's of the units or spend a fortune on eBay to get collector's figs.

There are a significant number of existing minis that gamers can use and I think that even with that "limited" number of units that the list will have a ton of options.

The list will have some "collectors" stats for things like Fiends and Beasts of Nurgle etc but I think it would be irresponsible to build an army list that only an epic collector could properly field.

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Guns don't break formations. Blast Markers break formations.

Yup. If you have access to them you can proxy them for Daemonic Constructs if you don't want to build your own

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Guns don't break formations. Blast Markers break formations.

I was thinking that formations could be anywhere from 6 to 12 units with there being some possible bonus (Augment Summoning or something fluffy) if you bought a formation that was that Factions sacred number.

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Ideas are like soda cans, recycling sucks
If you talk to God you're religious. If God talks to you, you're psychotic
My Epic Blog

Warmaster harpies are the easiest way to proxy these and don't look bad either

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Guns don't break formations. Blast Markers break formations.

Well, I think this army list is a very bad idea to begin with before fixing the daemons in the Chaos list. It's the same than making renegade legions with cultists marines while the "main" list isn't fixed.