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The Aspiring Sorcerer that's included with each Thousand Sons choice is a level 1 psyker. Does he get to choose his discipline from the normal options, or can he only take the Tzeentch discipline because the Thousand Sons unit has the Mark of Tzeentch?

The Chaos Codex answers this question. Look at the Psychic powers section.

If a psyker has a mark then they must have at least one psychic power from their god's selection. Thus only level 2 sorcerors may choose spells from disciplines other than their god's. =P

Alrighty, thanks for the answers. It's appreciated.

Page 70 of the Chaos Space Marines Codex, in case anyone was wondering...