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Sorcerer (Talent)
Prerequisites: Intelligence 35, Willpower 35, Forbidden Lore (Warp or Daemonology) +10 or Scholastic Lore (Occult) +10.
You may utilise the powers of sorcery and channel the power of the warp through a combination of esoteric lore, skill, and focused will. You count as having an effective Psy Rating of 2 (roll 2d10, etc.) and may learn a number of Arcana powers equal to three times your Willpower bonus, with Major powers counting as two powers each, without the necessity of further Talents.
When choosing Arcana powers, you are not bound by a particular type of power (such as the psyker Discipline framework), as sorcery is a fragmented and contradictory business. Characters, however, can only fill these power slots by seeking and mastering the rituals independently (either by dangerous experimentation, ancient lore, or dark bargains) and cannot be develop them naturally.
If a Character who already has a Psy Rating gains this Talent, it works differently (see page 119).
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So. Do you instatly get to choose those powers?
What do you do in your games? How do you resolve it?