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I think the real determining factor is that you have to deploy the building like you would other units in your force... and you can't stack units on top of each other. You can't put a space marine on the roof of a land raider, for example.

I think this has already been covered under the skysheild is terrain and a VSG is a fort. So you can.

 xSoulgrinderx wrote:
I think this has already been covered under the skysheild is terrain and a VSG is a fort. So you can.

Well they are both fortifications right?

Since they are, they can not be piled on top of one another.

Bojazz wrote:
Since fortifications are set up using the same rules for models and not terrain, I'd say you CAN put a void shield on top of a skyshield landing pad. But you can't put a grassy hill on top of it.

Except you can't because you can not put models on top of each other.

 DeathReaper wrote:

Except you can't because you can not put models on top of each other.

So.. can you put say, a tank on a skyshield? Or .. devastators on a bastion?

 Ghaz wrote:

 xSoulgrinderx wrote:
GUUUUYS. Just found out something really sad.... Only one fort is allow per ITC ruling.

*cue sad music*

And that only matters if you're using ITC's house rules. The rulebook does not limit you to a single Fortification.

The rulebook does limit the number of Fortifications you can take per the CAD. So I you want multiple, take Multiple CAD.

And even if you can put a VSG on the skyshield. You can't use the power to move them both, as the power requires you to end 1 inch away from other Terrain, can't do that when the terrain is literally on top of it.

 Chapter Master Angelos wrote:

 Ghaz wrote:

 xSoulgrinderx wrote:
GUUUUYS. Just found out something really sad.... Only one fort is allow per ITC ruling.

*cue sad music*

And that only matters if you're using ITC's house rules. The rulebook does not limit you to a single Fortification.

The rulebook does limit the number of Fortifications you can take per the CAD. So I you want multiple, take Multiple CAD.

And even if you can put a VSG on the skyshield. You can't use the power to move them both, as the power requires you to end 1 inch away from other Terrain, can't do that when the terrain is literally on top of it.

*Drops Mic*

 DeathReaper wrote:

Because there are no rules that allow terrain to be placed on top of other terrain.

Are you suggesting that you can't place a terrain piece on a hill? I think most players would disagree with that.

If a terrain piece is open ground how is placing something on it different to placing it on the table? Both are open ground.

If we can't place terrain on open ground then we've got a problem.

 Scott-S6 wrote:

 DeathReaper wrote:

Because there are no rules that allow terrain to be placed on top of other terrain.

Are you suggesting that you can't place a terrain piece on a hill? I think most players would disagree with that.

Fortunately, the rules do not disagree with that.

Though assuming a flat battlefield. one with built in hills well thats to be discussed with your opponent.

If a terrain piece is open ground how is placing something on it different to placing it on the table? Both are open ground.

Because the rules say you need to place terrain on the battlefield. The rules do not say to place terrain on open ground...

If we can't place terrain on open ground then we've got a problem.

Again the rules say you need to place terrain on the battlefield. The rules do not say to place terrain on open ground.

The rules say that the battlefield can include terrain. Suggesting that the battlefields includes any terrain taken

 DeathReaper wrote:

 Scott-S6 wrote:

 DeathReaper wrote:

Because there are no rules that allow terrain to be placed on top of other terrain.

Are you suggesting that you can't place a terrain piece on a hill? I think most players would disagree with that.

Fortunately, the rules do not disagree with that.

Though assuming a flat battlefield. one with built in hills well thats to be discussed with your opponent.

If a terrain piece is open ground how is placing something on it different to placing it on the table? Both are open ground.

Because the rules say you need to place terrain on the battlefield. The rules do not say to place terrain on open ground...

If we can't place terrain on open ground then we've got a problem.

Again the rules say you need to place terrain on the battlefield. The rules do not say to place terrain on open ground.

Where is the battlefield defined as the tabletop excluding terrain?

I'm fairly satisfied that - daft as it is- a bastion could be deployed on a skyshield.
Follow up questions
1: is a skyshield bought as a fortification a 'terrain feature' for the purpose of shifting workscape?
It doesn't have a terrain datasheet(it has a fortification datasheet instead) but does have a terrain type. Assuming it is ..

2: can it be moved with the bastion remaining on top?

Now it's been pointed out that shifting worldscape says you can't end within 1" of another terrain feature. But it also says 1" of any other models. So it is pretty clear that models moving with it aren't included in this restriction.
Is the bastion a unit? When claimed by a player it functions as a unit in that players army, so yes.

It's weird as hell but actually looking legitimate. I can already picture the silver tower of tzeentch floating on its platform of magical fire. .. hahahaha evil laugh etc.

 jokerkd wrote:
The rules say that the battlefield can include terrain. Suggesting that the battlefields includes any terrain taken

Except the rules say...

|Page 130: "The battlefield is usually a flat surface on which scenery models are placed and over which the armies fight"

So the battlefield and the scenery upon it are not the same thing.

 Scott-S6 wrote:
Where is the battlefield defined as the tabletop excluding terrain?

Page 130, quote above.

Captyn_Bob wrote:
I'm fairly satisfied that - daft as it is- a bastion could be deployed on a skyshield.

It can not.

Follow up questions
1: is a skyshield bought as a fortification a 'terrain feature' for the purpose of shifting workscape?
It doesn't have a terrain datasheet(it has a fortification datasheet instead) but does have a terrain type. Assuming it is ..

Yes the skyshield is terrain.

2: can it be moved with the bastion remaining on top?

No, as noted above, shifting worldscape says you can't end within 1" of another terrain feature, if you allow a house rule for a bastion upon a Skyshield you can not move the skyshield with shifting worldscape because you would end within 1" of another terrain feature.

Now it's been pointed out that shifting worldscape says you can't end within 1" of another terrain feature. But it also says 1" of any other models. So it is pretty clear that models moving with it aren't included in this restriction.
Is the bastion a unit? When claimed by a player it functions as a unit in that players army, so yes.

It's weird as hell but actually looking legitimate. I can already picture the silver tower of tzeentch floating on its platform of magical fire. .. hahahaha evil laugh etc.

Can not happen, read the above as to why not.

So is it your position that Shifting Worldscape can never be used on a piece of terrain if there are any units with all of their models on said terrain? I could see that being the case for RAW.

Except the rules also say that the battlefield can include terrain.
Your's says "usually" mine says "can".
Neither is definitive. The rules are typically ambiguous. What it is specific about is that the way the scenery is set up is entirely up to the players

Speak to your opponent, come to an agreement.

Where are in the rule book are you getting the idea that fortifications must be placed on the battlefield. Fortifications taken as part of your army are set up differently than those that you purchase.

For setting up citadel terrain the book says

"Exactly how you set up Citadel scenery models is purely a matter of personal taste, and they can be placed upon the battlefield in any way the players find agreeable."

Its a rule literally saying set it up however you and your opponent like. Also it only pertains to pieces of terrain that are placed before the game starts. If you want to stack a pile of based hills up to the roof than that is fine. Do whatever you want, its a matter of taste.

Just underneath this in fortifications it says that
"If a fortification is taken as part of an army, then it is set up with the rest of the units in the army using the same deployment rules as the other models."

So if you're setting up neutral terrain just set it up however you and you're opponent fancy. If your setting up purchased fortifications than set them up just like other models.

Here is how you deploy models
"Models can be deployed ‘inside’ buildings, fortifications, or Transport vehicles in their deployment zone, subject to their Transport Capacity. Units may not be deployed in impassable terrain. Note that models must be deployed fully within their deployment zone: you can’t have part of a model inside the deployment zone and part of the model outside it!"

You can place other models on a sky shield, so you can place a VSG on a sky shield.

Yeah it all seems fine. If someone can quote a rule that restricts it, that'd be fine too. But I can't see any.

 coblen wrote:
Where are in the rule book are you getting the idea that fortifications must be placed on the battlefield. Fortifications taken as part of your army are set up differently than those that you purchase.

For setting up citadel terrain the book says

"Exactly how you set up Citadel scenery models is purely a matter of personal taste, and they can be placed upon the battlefield in any way the players find agreeable."

Its a rule literally saying set it up however you and your opponent like. Also it only pertains to pieces of terrain that are placed before the game starts. If you want to stack a pile of based hills up to the roof than that is fine. Do whatever you want, its a matter of taste.

Just underneath this in fortifications it says that
"If a fortification is taken as part of an army, then it is set up with the rest of the units in the army using the same deployment rules as the other models."

So if you're setting up neutral terrain just set it up however you and you're opponent fancy. If your setting up purchased fortifications than set them up just like other models.

Here is how you deploy models
"Models can be deployed ‘inside’ buildings, fortifications, or Transport vehicles in their deployment zone, subject to their Transport Capacity. Units may not be deployed in impassable terrain. Note that models must be deployed fully within their deployment zone: you can’t have part of a model inside the deployment zone and part of the model outside it!"

You can place other models on a sky shield, so you can place a VSG on a sky shield.

This has been the best answer to OP's question so far. I will say that this argument wins and had enough validation and rules references to thump a judge,

 xSoulgrinderx wrote:

 coblen wrote:
Where are in the rule book are you getting the idea that fortifications must be placed on the battlefield. Fortifications taken as part of your army are set up differently than those that you purchase.

For setting up citadel terrain the book says

"Exactly how you set up Citadel scenery models is purely a matter of personal taste, and they can be placed upon the battlefield in any way the players find agreeable."

Its a rule literally saying set it up however you and your opponent like. Also it only pertains to pieces of terrain that are placed before the game starts. If you want to stack a pile of based hills up to the roof than that is fine. Do whatever you want, its a matter of taste.

Just underneath this in fortifications it says that
"If a fortification is taken as part of an army, then it is set up with the rest of the units in the army using the same deployment rules as the other models."

So if you're setting up neutral terrain just set it up however you and you're opponent fancy. If your setting up purchased fortifications than set them up just like other models.

Here is how you deploy models
"Models can be deployed ‘inside’ buildings, fortifications, or Transport vehicles in their deployment zone, subject to their Transport Capacity. Units may not be deployed in impassable terrain. Note that models must be deployed fully within their deployment zone: you can’t have part of a model inside the deployment zone and part of the model outside it!"

You can place other models on a sky shield, so you can place a VSG on a sky shield.

This has been the best answer to OP's question so far. I will say that this argument wins and had enough validation and rules references to thump a judge,

Except you can not place models on top of other models.

 DeathReaper wrote:

 xSoulgrinderx wrote:

 coblen wrote:
Where are in the rule book are you getting the idea that fortifications must be placed on the battlefield. Fortifications taken as part of your army are set up differently than those that you purchase.

For setting up citadel terrain the book says

"Exactly how you set up Citadel scenery models is purely a matter of personal taste, and they can be placed upon the battlefield in any way the players find agreeable."

Its a rule literally saying set it up however you and your opponent like. Also it only pertains to pieces of terrain that are placed before the game starts. If you want to stack a pile of based hills up to the roof than that is fine. Do whatever you want, its a matter of taste.

Just underneath this in fortifications it says that
"If a fortification is taken as part of an army, then it is set up with the rest of the units in the army using the same deployment rules as the other models."

So if you're setting up neutral terrain just set it up however you and you're opponent fancy. If your setting up purchased fortifications than set them up just like other models.

Here is how you deploy models
"Models can be deployed ‘inside’ buildings, fortifications, or Transport vehicles in their deployment zone, subject to their Transport Capacity. Units may not be deployed in impassable terrain. Note that models must be deployed fully within their deployment zone: you can’t have part of a model inside the deployment zone and part of the model outside it!"

You can place other models on a sky shield, so you can place a VSG on a sky shield.

This has been the best answer to OP's question so far. I will say that this argument wins and had enough validation and rules references to thump a judge,

Except you can not place models on top of other models.

Please explain? I can place models on a bastion, which is a model I paid for.

The top of the skyshield is treated as open ground. And you can place models on open ground.

indeed...

Not sure id Deathreaper is troll....

Same for battlements, I.e the bastion


Automatically Appended Next Post:
It's correct you can't put models on models but there are exceptions

Captyn_Bob wrote:
The top of the skyshield is treated as open ground. And you can place models on open ground.

But it is also set up like other modes and as such can not have model on top of it while deploying.

 DeathReaper wrote:

Captyn_Bob wrote:
The top of the skyshield is treated as open ground. And you can place models on open ground.

But it is also set up like other modes and as such can not have model on top of it while deploying.

not true at all, that would mean you have to deploy near the skysheidl then move onto it.

I'm out.

 xSoulgrinderx wrote:

 DeathReaper wrote:

Captyn_Bob wrote:
The top of the skyshield is treated as open ground. And you can place models on open ground.

But it is also set up like other modes and as such can not have model on top of it while deploying.

not true at all, that would mean you have to deploy near the skysheidl then move onto it.

That is correct, you have to deploy near the skysheild then move onto it.

Where in the rule book does it say that models cannot be deployed on top of each other?

 DeathReaper wrote:

 xSoulgrinderx wrote:

 DeathReaper wrote:

Captyn_Bob wrote:
The top of the skyshield is treated as open ground. And you can place models on open ground.

But it is also set up like other modes and as such can not have model on top of it while deploying.

not true at all, that would mean you have to deploy near the skysheidl then move onto it.

That is correct, you have to deploy near the skysheild then move onto it.

Please provide reading material to support your claims.

 DeathReaper wrote:

 xSoulgrinderx wrote:

 DeathReaper wrote:

Captyn_Bob wrote:
The top of the skyshield is treated as open ground. And you can place models on open ground.

But it is also set up like other modes and as such can not have model on top of it while deploying.

not true at all, that would mean you have to deploy near the skysheidl then move onto it.

That is correct, you have to deploy near the skysheild then move onto it.

But we are told if we use the ready for takeoff upgrade we can deploy flyers onto the skyshield. Clearly a model on top of another model, and as you're fond of saying, terrain pieces are not models, so you only have models on top of terrain.

You were doing good for a while there but you might want to reel it in a bit. Or what about forests, rivers, and hills, can models deploy onto them?

sirlynchmob wrote:
But we are told if we use the ready for takeoff upgrade we can deploy flyers onto the skyshield. Clearly a model on top of another model, and as you're fond of saying, terrain pieces are not models, so you only have models on top of terrain.

You were doing good for a while there but you might want to reel it in a bit. Or what about forests, rivers, and hills, can models deploy onto them?

Wow it is like the ready for takeoff upgrade has a specific exception...

Forests, rivers, and hills are not Fortifications, why wouldn't you be able to deploy there?

 coblen wrote:
Where in the rule book does it say that models cannot be deployed on top of each other?

Permissive ruleset, is there anything stating you can?