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This is from the 40K FAQ

Q. Can Psychic powers be used on a unit
embarked on a transport?
A. For simplicity’s sake, the answer has to be a
firm ‘No, unless the psyker himself is in the unit
being transported’.

From a RAW Argument you are probably correct, I just see most people saying that you can't use any power on a unit embarked unless the model casting the power is also embarked with said unit, because of the FAQ. This regardless if the power specifies model or unit, as the FAQ clearly states unit and says no.

Gwar! wrote:

sbeasley wrote:This is from the 40K FAQ

Q. Can Psychic powers be used on a unit embarked on a transport?
A. For simplicity’s sake, the answer has to be a firm ‘No, unless the psyker himself is in the unit being transported’.

From a RAW Argument you are probably correct, I just see most people saying that you can't use any power on a unit embarked unless the model casting the power is also embarked with said unit, because of the FAQ. This regardless if the power specifies model or unit, as the FAQ clearly states unit and says no.

Guess what? Something that applies to psychic powers does not apply to non psychic powers.

-Le gasp!-

My apologizes. Not having the Tyranid codex I assumed the "power" was a psychic power.

Interesting, I guess as it is right now it would affect transported units. Makes me wonder about the vibro cannon in the Eldar codex since it states any unit on the line takes d6 hits. If the line passed over a transport would the unit being transported take d6 hits? I realize the unit cannot be targeted, but vibro cannons don't require a target, just draw a line. And it specifies unit and not models as well.

willydstyle wrote:I would say "no" as the rules on page 66 are specific about having to measure range to a unit. The line of the vibro cannon is not measuring range to the unit, so it does not have a mechanic for affecting the unit in the transport.

If I needed to measure range to that unit I would use the hull. Is all I see about measuring range.

The vibro cannon doesn't require measuring range to a unit. It states to draw a 36" line in any direction and any unit that the line passes through suffers d6 hits. The vibro cannon doesn't even require an initial target. I just roll to hit, and draw a line. How is this different from the power specified in the Tyranid codex? Other than one is an area affect and one is a line, and one being a "Power" and one being a weapon.