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If there is another post already discussing this topic, please point me to it. I did look but did not see one.

Among my game group there is some debate as to what powers Magnus does and does not have. For those that don't know, his rules state that he knows all powers of Change and Tzeentch, as well as the 'Gaze of Magnus' power. It says nothing about him being able to generate powers. However the FAQ for the CSM codex states that all Psykers of the CSM faction can generate powers from Daemonology: Malefic. Traitor's Hate and Traitor Legions both state that any Psyker with the CSM Faction can generate powers from Sinistrum, Heretech, Ectomancy, and Geomortis.

It's also been established (via Kairos Fateweaver), that a model can know certain powers and still generate powers (granted this is a special rule for him, but there is precedence), even though doing so would put them above the normal number of powers they can have for their level. Now I get that Magnus would not be able to generate powers from the Core Rulebook, since there is nothing to support him getting an exception from any source. So what powers would Magnus be able to generate from?

When a psyker has fixed powers known they're not allowed to choose to generate powers, period, regardless of other rules. If you were allowed to have Magnus generate powers from the Traitor Legions disciplines you'd also be allowed to have Grey Knights generate powers from the Angels of Death disciplines instead of being stuck with Banishment/Hammerhand (granted, that'd be a massive improvement, but it isn't actually allowed).

 AnomanderRake wrote:
When a psyker has fixed powers known they're not allowed to choose to generate powers, period, regardless of other rules. If you were allowed to have Magnus generate powers from the Traitor Legions disciplines you'd also be allowed to have Grey Knights generate powers from the Angels of Death disciplines instead of being stuck with Banishment/Hammerhand (granted, that'd be a massive improvement, but it isn't actually allowed).

not true, Grey Knights are of the Grey Knights faction, the powers in the Angels of Death Supplement says any Psyker of the Space Marine faction can generate those powers. Since Grey Knights are not a Space Marine faction, they cannot.

Ravingbantha wrote:
not true, Grey Knights are of the Grey Knights faction, the powers in the Angels of Death Supplement says any Psyker of the Space Marine faction can generate those powers. Since Grey Knights are not a Space Marine faction, they cannot.

I'm sure it was also addressed in the FAQs, but I can't spot it right now.

beast_gts wrote:

Ravingbantha wrote:
not true, Grey Knights are of the Grey Knights faction, the powers in the Angels of Death Supplement says any Psyker of the Space Marine faction can generate those powers. Since Grey Knights are not a Space Marine faction, they cannot.

Spoiler:

I'm sure it was also addressed in the FAQs, but I can't spot it right now.

https://www.dakkadakka.com/dakkaforum/posts/list/0/717711.page

The cards say what a faction may access, but the rules in the books I listed (including Angels of Death) state ANY psyker of that faction may access said powers.

Ravingbantha wrote:
The cards say what a faction may access, but the rules in the books I listed (including Angels of Death) state ANY psyker of that faction may access said powers.

As a Psyker with the Chaos Space Marines Faction he would be able to use those tables, but as a psyker with fixed known powers he may not choose to generate powers at all, no matter what table you want to use (small rulebook page 23).

The wording of the rule in Traitor Legions ("Any Psyker with the Chaos Space Marines Faction can generate their psychic powers from [these disciplines]...in addition to any other disciplines they have access to." (emphasis added)) gives you the ability to access more disciplines, not the ability to generate powers when you couldn't already.

Especially since Magnus came out after Traitor's Hate and wouldn't have needed any qualifiers like that while other Psycher units that also came out after Traitor's Hate (see Scarab Occult, Exalted Sorceror etc) CLEARLY list what disciplines they can select for power generation. Magnus knows the powers of Tzeentch, Change, Gaze and may not roll for anything else.