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Okay so when using a tremor stave on a unit of lets say blood angel assault marines with a priest it "hits" the unit no wounds are scored but the "unit" is now considers its movement in open ground to be in difficult terrain.
My royal court of 5 lords and an overlord assault the unit , will the marines strike at in 1 ? also if the same marines assault a unit of mine will they be at in 1 , in 2( for furious charge ) or ignore it all together ? Thanks in advance!

The marines all have frag grenades as default so they ignore the I reduction for taking a Difficult/Dangerous Terrain test.

Not to mention, you don't suffer the I bonus when being assaulted in terrain

As Spel said, marines have Frag grenades default so they ignore that.

misread jd's post. but if the Marines assault they have offensive grenades so they ignore the terrain in regards to I.

Well I was under the impression that frag grenades only work on the charge for marines

Also it only makes the ground dificult for the units next movement phase.

That answers all of your questions right there.

Eyesedragon wrote:Well I was under the impression that frag grenades only work on the charge for marines

Even if that's true, you only suffer the I penalty if you have to roll for difficult terrain. Since they are the unit being assaulted, they don't roll, hence aren't penalized.

Just like when someone charges a unit in difficult terrain - the charger takes the penalty, the chargee does not.