It's actually once you hit 41. You'll get an option for an Epic power pool if you're a hero (a second button will appear underneath the "choose a new power pool" one in the level up screen). If you're a villain you need to do one of the patron arcs first though (don't worry about which one, you can pick any pool regardless of patron).
EDIT: Also, 1,000 posts 
The arc that gives access to the patron powers becomes available at level 40. That's probably what the OP had heard about.
@Roderick
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Well, technically I believe toons unlock access to Ancillary/Patron pools at 40, but since you can't actually chose a power until 41, it's all sort of academic.
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Originally Posted by Roderick
The arc that gives access to the patron powers becomes available at level 40. That's probably what the OP had heard about.
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Quote:
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Originally Posted by FuryFury
I remember somewhere someone or something saying something about a special power pool when you hit level 40. Do I have to go somewhere special? I didn't see it on the power pool selection when I leved up.
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Hero-side: Ancillary (Epic) Power Pools
Villain-side: Patron Power Pools
PS: If you are villain-side you can start working your way toward a patron at 40 by seeing Arbiter Rein
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"Chew Electric Death, Snarling Cur!"
I remember somewhere someone or something saying something about a special power pool when you hit level 40. Do I have to go somewhere special? I didn't see it on the power pool selection when I leved up.