I think you mean Power Boost - Conserve Power gives End Discount for a short while.
It boosts "disorients, holds, immobilizes, knockback distance, fly, run" by 100%. The villain version also grants +100% def and +100% Res according to a hero builder.
@Under Control
It (power boost) boosts all secondary effects (yeah hold is a secondary effect of a hold by that logic). I'm one level away from verifying it myself, but that includes heal numbers in (for example) aid self, allegedly.
Not sure if it boosts flight speed like the controller epic.
It is an awesome power though ... that and domination together is evil 
Synaesthetix:if your mum wasn't already dead I would go kill her for bringing
you into the world
Hmmm The controller epic definitely increases the amount you heal...
@Under Control
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Not sure if it boosts flight speed like the controller epic.
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It sure does :O)
I fondly remember flying between missions, hitting power boost and getting that afterburner feeling.
Doesnt this power also boost hold mag?
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Fiend Space: 211464
Beware what is say in hero builder! It buffs +def but not +res.
It boosts fly, it boosts jump, it boosts sprint, it boosts endurence recovery, including what you get from stamina, etc etc.
Is a great power for a dominator.
I really should do something about this signature.
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Not sure if it boosts flight speed like the controller epic.
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It sure does :O)
I fondly remember flying between missions, hitting power boost and getting that afterburner feeling.
Doesnt this power also boost hold mag?
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Theres only one power in entire game to buff hold mag, Domination. And actually even it doesnt do it, it just makes copies of holds/mezzes giving the impression of double magnitude.
Power boost buffs hold/sleep/confuse/stun/fear duration though and that is capital. Aid self could be nice to have on a /en dominator because of power boost..
Okay, so I got my power names mixed up when I wrote the post. 
Thanks for the clarification though, I wasn't sure if the power was actually 'doing' anything, but now I know it is. 
Isn't the Controller version 200%? Seeing how the Dominator version is 100% and how the epics are supposed to be weaker in either effectiveness or availability, this is sad.
Anyhow it's a good power, you can double the heal from Aid Self or combine it with Domination and Megalomaniac.
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Isn't the Controller version 200%?
[/ QUOTE ]AFAIK, every version of power boost doubles secondary effects, thus they're 100%.
I've hit level 16, and got this power. I understand it boosts 'secondary effects' and I presume from the description, it increases the length of Holds.
Does this power have any other uses for a Grav/En other than the Hold buff, and when's the best time to use it?