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Main Rulebook wrote:Perils of the Warp
If you roll a double 1 or a double 6 when taking a Psychic test, the psyker immediately suffers Perils of the Warp. The psyker suffers D3 mortal wounds as the forces of the Daemon-haunted warp claw at their mind. If the psyker is slain by Perils of the Warp, the power they were attempting to manifest automatically fails and each unit within 6" immediately suffers D3 mortal wounds, as the psyker is dragged into the warp or else detonates in a burst of empyric feedback.

Various Special Rules for PSYKER units wrote:When manifesting or denying a psychic power, first select a model in the unit – measure range, visibility, etc. from this model. If this unit suffers Perils of the Warp, it suffers D3 mortal wounds as described in the core rules, but units within 6" will only suffer damage if the Perils of the Warp cause the last model in the manifesting unit to be slain."

So, my question is, if a unit (as opposed to a single model) attempts to manifest a power, and suffers a perils of the warp, causing enough mortal wounds to slay the model "selected" as above, but doesn't cause enough to slay the entire unit, does this cause the power to fail, or does it only fail if it's the last model in the unit?

Nope. 3 trys and I cant work it out

You're only selecting a model to measure range and visibility from, the entire unit is 'the psyker', which is why other units don't take damage unless the perils kills the last model in the unit.

So yeah, the power only fails if the psyker (in this case the entire unit) gets killed by the perils damage. And there's not even any requirement to kill the selected model with the perils damage (if there are other models in the unit to soak it instead).

I don't believe that you've actually selected a model at the point when you're assigning mortal wounds to the unit. You don't pick a model until you're manifesting the power. You take the psychic test in order to see if you manifest the power, and if you Perils you immediately suffer mortal wounds. So I don't think it's even possible for there to be a weird interaction where the model that you're supposed to be measuring range from has died -- you have to pick one that's still alive.

Can anyone provide some clarification on this? This happened in a game I played last night where a grey knight squad failed a psychic test. We played it that since a model did die from the failed test that the other units around it would take the D3 mortal wounds. Was this correct since only two out of five models in the unit that failed the test died, or would the failed test need to kill all models in the unit for the explosion that hurts nearby units to go off. Thanks!

Yakface had it right I feel. I think I was overthinking it and overcomplicating it.

 yakface wrote:
You're only selecting a model to measure range and visibility from, the entire unit is 'the psyker', which is why other units don't take damage unless the perils kills the last model in the unit.

So yeah, the power only fails if the psyker (in this case the entire unit) gets killed by the perils damage. And there's not even any requirement to kill the selected model with the perils damage (if there are other models in the unit to soak it instead).

 Mud Turkey 13 wrote:
Can anyone provide some clarification on this? This happened in a game I played last night where a grey knight squad failed a psychic test. We played it that since a model did die from the failed test that the other units around it would take the D3 mortal wounds. Was this correct since only two out of five models in the unit that failed the test died, or would the failed test need to kill all models in the unit for the explosion that hurts nearby units to go off. Thanks!

For this question it is very clearly the whole unit must die to perils for the nearby units to suffer feedback. It is the end fragment of the psyker rules on all of the gk units.

I easily see where someone, on a quick read through and having a 'wait a moment' moment like I often have with these Rules, might wonder if 'ect' also meant the Model selected still Perils and other such things.
Next logical step is to then wonder if that is in addition to what is occurring on the Unit level, given it states: as described in the core rules, or if the Model gets a free pass even though technically is still the Model that periled and died.

The various Rules on 'Units of Psykers'' clearly do more then just give permission to select the Unit as a Psyker, they replace a section of the Rule called 'Perils' with instructions on how to handle this at the Unit-Level. I view it as giving us a new Sequence for Unit-level Psykers to follow, but doing so in the typical short hand format of Game Workshop. Instead of writing out the whole Sequence from start to end it simply states 'change this part to this, and do this instead when this occurs.' As the obvious intent was to treat the Unit as a single Psyker, something they have always had a hard time doing within the Unit/Model format, the whole Unit needs to be destroyed for the Warp-Rift to happen.

Narrative wise - These are lower level Psychic users, as the very reason they are put in a Unit in the first place is to daisy chain them together to make a single "Pskyer." When one of these low level users die it isn't with the same explosive nature of a normal Psyker, it is more like a fuse going pop within these people instead of an Tesla arc. This death gives the rest of a Unit a boost in power, it is a big thing in rituals for a reason, and this allows them to continue operating as a full Psyker for the remainder of the game. When the very last one of these daisy chained individuals bites the chainsaw blade, all that energy has been built up inside a tiny little fuse that somehow hasn't yet popped on it's own.... that will make one hell of a mess!

Hell, after the battle they do shoot many psychic user from a safe distance 'in the Emperors Name and by his Mercy...' after-all.

PS, because I always rant on it when I encounter it:
The use of ect is very very very very very bad Rule writing, I have a personal distaste in using all-inclusive terms like ect and and so forth, as they can leave one wondering... when to stop....

Personally, just reading the rules, I would play it like yakface said. In this instance the unit is considered the "model" for psycher rules. And that means to get the power to fail you have to kill all of the models in the unit with a perils of the warp roll.

I appreciate the information! It was the first game for both my roommate and I, so we are still working through a lot of the rules.