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Tremor-
Any unit hit by a subterranean blast will move as if in difficult terrain in its following Movement phase. If the unit is actually moving through difficult terrain, it rolls one less dice than normal to determine its maximum move. A vehicle hit by a Tremor shell must take a dangerous terrain test if it moves in the following Movement phase. This even applies to skimmers, whose delicate grav-engines are pummeled by shockwaves.

If I am running at least 2x TFC and both fire the Subterranean blast at the same unit, do both effects occur?
So, I guess what I'm asking is, do the effects stack?

I fire one TFC, get a hit.
The unit will move as if in difficult terrain
I fire the second TFC get a hit
1 less dice for movement?

(Presuming the unit hit doesn't have Move Through Cover.)
1) If a unit in "the open" is hit by 2 different Tremor rounds(from 2x TFC), do they roll 1d6 for movement?

2) If a unit in "difficult terrain" is hit by 2 different Tremor rounds(from 2x TFC), are they allowed to move at all? 2D6 -1D6 -1D6 = 0D6.

I wasn't sure if there were separate instances of the ability on the unit or what as I've never seen anyone ask about it.
I was looking at it and thought "Wait, if I have 3x TFC and each hit is -1D6(so -3D6) think about being able to effectively "pin" a unit of Warriors or Thunder wolves in your opponents deployment zone"

I don't believe subsequent hits would 'stack' but admittedly there is nothing in the rules one way or the other. I think this is an example of rule WYSIWYG where you get what the rule says and nothing more. However, if a unit with move through cover is in difficult terrain and is hit, I think it would roll 2D6 its next movement phase rather than 3D6.
If subsequent tremor hits would pin a unit or immobilize a vehicle, I think the rule would have to reflect this.

paidinfull wrote:

Tremor-
Any unit hit by a subterranean blast will move as if in difficult terrain in its following Movement phase. If the unit is actually moving through difficult terrain, it rolls one less dice than normal to determine its maximum move. A vehicle hit by a Tremor shell must take a dangerous terrain test if it moves in the following Movement phase. This even applies to skimmers, whose delicate grav-engines are pummeled by shockwaves.

If I am running at least 2x TFC and both fire the Subterranean blast at the same unit, do both effects occur?
So, I guess what I'm asking is, do the effects stack?

I fire one TFC, get a hit.
The unit will move as if in difficult terrain
I fire the second TFC get a hit
1 less dice for movement?

(Presuming the unit hit doesn't have Move Through Cover.)
1) If a unit in "the open" is hit by 2 different Tremor rounds(from 2x TFC), do they roll 1d6 for movement?

2) If a unit in "difficult terrain" is hit by 2 different Tremor rounds(from 2x TFC), are they allowed to move at all? 2D6 -1D6 -1D6 = 0D6.

I wasn't sure if there were separate instances of the ability on the unit or what as I've never seen anyone ask about it.
I was looking at it and thought "Wait, if I have 3x TFC and each hit is -1D6(so -3D6) think about being able to effectively "pin" a unit of Warriors or Thunder wolves in your opponents deployment zone"

no, because tremor shot specifically states that the unit moves "as if" in difficult terrain, and only rolls one less die if it "is actually" in difficult terrain

you could shoot 100 thunderfires at a unit in the open, and they would just move as if in difficult terrain (normally 2d6, pick the highest) and you could shoot 100 thunderfires at a unit already in difficult terrain and they would just roll 1 less die, (normally 2d6, now 1d6 pick the highest)

Demogerg is 100% spot on.

Ok so that was 1 question.
What about if they are actually in terrain?
Are the -1D6 cumulative?

So 3x TFC = 3x Sub effect hits on a unit in difficult terrain... -3d6?

Demogerg wrote: and you could shoot 100 thunderfires at a unit already in difficult terrain and they would just roll 1 less die, (normally 2d6, now 1d6 pick the highest)

paidinfull wrote: Ok so that was 1 question.
What about if they are actually in terrain?
Are the -1D6 cumulative?

No, they are not.

paidinfull wrote:So 3x TFC = 3x Sub effect hits on a unit in difficult terrain... -3d6?

No, 3x (or 4x or 5x, etc) still results in the unit rolling 1 less die.
So normal unit roll 1D6, move through cover unit rolls 2D6.
The rule for tremor would have to specify that the effects of multiple blasts would stack.