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If a squad of any Grey Knights with force weapons cast Hammer Hand are they allowed to activate force weapons as well, or does the force weapon use up a psychic ability?

You could only use the Force Weapons.

And you are absolutely sure about this?

Yes.

Alrighty, thanks a bunch!

Regular GK squads are mastery level 1.

This means they can use 1 power per turn.

So if you want them to cast hammerhand, they can't then use the ID bonus effect of the FW, as this would be a 2nd power use.

One or the other, not both.

Same thing goes for Purifires, either Clensing Flame, Hammerhand, or Activate force weapons for ID.

Activating your force weapons is the same as casting a psychic power. Thus you must have a power use remaining that turn to be able to activate it. IF you activated hammerhand that turn and were mastery level 1 then you would not be able to make that test for activation. All about the choices.

However, the squad could have a Librarian or a GKGM attached. the libby or GKGM could cast hammerhand, which effects everyone, and then the squad could activate their Force Weapons.

Grey Templar wrote:However, the squad could have a Librarian or a GKGM attached. the libby or GKGM could cast hammerhand, which effects everyone, and then the squad could activate their Force Weapons.

While true, it is still not relevant to the question as it was asked if the SQUAD could use a power AND their force weapons in the same turn or not. Good point though

it could be relevent. This very question has been asked many times, with the Gk player having hammerhand and force weapons at the same time, and it turns out that there was a Libby or GM attached to the squad that wasn't mentioned.

Hence why I said the question as asked. If the situation had been more specific then it would have been even better. I agree though that understanding those IC interactions with the squads powers is necessary to using the units legally/correctly

is that one power per player turn or one power per turn?

ie: hammerhead on my turn, during opponent assault phase activate force weapons

Lobukia wrote:is that one power per player turn or one power per turn?

ie: hammerhead on my turn, during opponent assault phase activate force weapons

Player turn is the default unless otherwise specified in the rule book so in this case, it's player. So you may use hammer hand on your turn and then on his turn use force weapons if you see fit