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So, I found this in the errata, dated Sept 13, 2013:

Q: Can psychic powers be mixed and matched from the psychic disciplines and those found in the Codexes? (p418)
A: No. You may select from the psychic powers listed in the Codex as normal or swap them for a number of rolls on the psychic disciplines tables.

Now, it has been cited (in another thread) as an item to deal with older codexes, like SW. So that you have to go wholly with Wolf stuff, or solely with the Rule Book's Psy-powers.

*I* just recently saw the ruling and thought that it was to mean the same for *all* the codexes. All codex or all RB.

Q: Did I honk that up?

Can a player still, say:

Have his farseer roll in the codex, get one power (Guide) , then *switch* to the RB and nab Prescience and a Telepathy item?

Giving examples really helps with this kind of thing.

My understanding is that you must choose one or the other. Rulebook, or codex - not both.

Given chaos have to roll rule book powers, they aren't allowed to roll just their lore (depending on mastery level ) this cannot apply to every book.

"...from the psychic disciplines..." - Runes of Fate is a psychic discipline.

Just so its clear, the date of sep 13 is the date of most recent update to the BRB FAQ that specific FAQ has been in it for quite a while longer.

As I linked before its purpose is to deny choosing psychic power from 5th edition codexes and than rolling on the tables.

All 6th edition codex powers are "psychic disciplines" and therefore allow you to take them from the "psychic disciplines" found both in the 6h edtion codexes and in the 6th edtion BRB

Wait, really?

So my Farseer can roll one power from Runes of Fate, and then roll two powers from Telepathy?

When do you decide this? Do I have to declare before I start rolling that "I'm going to roll 1 power from this table and two from this table"?

Or for example, if I roll once on Runes of Fate, but don't get the power that I want, can I roll a second time on Runes of Fate, and then depending on what power I get, decide to roll my last power from Telepathy?

You decide per power.

You generate powers like this...

1) Pick a Tree
2) Generate a power
3) If you already have it, or it's cost is too high (2 WC cost and you're lvl 1), re-roll
4) If you don't like it, you can swap for the primaris (if you haven't already)
-- Repeat as needed

For example (Farseer)
I pick Runes of Fate, I get Death Mission, I swap it for Guide.
Terrified of getting stuck with Death Mission again, I decide to roll on Divination, ohhh boy, Scryer's Gaze! I swap it for Prescience. Now both tree's are hazards, I decide to roll on Telepathy. I roll Invisibility! It tastes like winning, so I keep it.

 loreweaver wrote:
You generate powers like this...

1) Pick a Tree
2) Generate a power
3) If you already have it, or it's cost is too high (2 WC cost and you're lvl 1), re-roll
4) If you don't like it, you can swap for the primaris (if you haven't already)
-- Repeat as needed

For example (Farseer)
I pick Runes of Fate, I get Death Mission, I swap it for Guide.
Terrified of getting stuck with Death Mission again, I decide to roll on Divination, ohhh boy, Scryer's Gaze! I swap it for Prescience. Now both tree's are hazards, I decide to roll on Telepathy. I roll Invisibility! It tastes like winning, so I keep it.

This is very helpful, thank you.

We'd been rolling powers all at once, all from the same table.

So if you rolled Death Mission 3 times for example, you discarded the duplicates and re-rolled until you had 3 different results. Then, if you wished, you could exchange one of the powers for the Primaris power. This basically guaranteed you'd never end up with Death Mission, but we also thought you always had to roll everything on the same table.

Murrdox wrote:

We'd been rolling powers all at once, all from the same table.

So if you rolled Death Mission 3 times for example, you discarded the duplicates and re-rolled until you had 3 different results. Then, if you wished, you could exchange one of the powers for the Primaris power. This basically guaranteed you'd never end up with Death Mission, but we also thought you always had to roll everything on the same table.

This procedure goes directly against the rules laid out for generating psychic powers in the BRB. After each roll, you must decide whether to swap for Primaris.
Ex: I roll on Biomancy and get Enfeeble. Since I'm fighting an all-grot army (?) I decide to swap for Smite (Primaris). I roll again on Biomancy and get Enfeeble. Too bad for me, I now have to take Enfeeble, since I already have the Primaris!

Okay. So, which books are subject to the all or none errata?

SW, GK, IG? Right?

BA, GK, IG, SW and Nids.

Brothererekose wrote:
Okay. So, which books are subject to the all or none errata?

You either roll for your powers on psychic discipline tables, or you don't. That's the all-or-none. All the new codexes which always roll their psychic powers on psychic discipline tables are essentially unaffected, as they have no option to select their powers in the first place.

point of order: Grey knights are only 'mostly' subject to that rule. A grey knight librarian gets to keep something a little something special for himself as indicated in the FAQ even if you random-roll on the psychic discipline tables.

I remember when this first popped up at my game store and Eldar players were upset because they couldn't take guide and prescience together anymore, then someone intelligent pointed out that the wording is how you determine, like someone earlier said, choosing psychic powers is different then rolling on psychic disciplines.