Does it stack? If I use it on someone multiple times in a round and they all hit, could I prevent them from doing 4-5 different active actions?

Obviously everything is up to house rule interpretation, but some kind of guideline if it exists would be nice to have.

I see no reason why you shouldn't be able to use the same power several times in one turn:

Finally if you want to maintain the powers it will take 1 innate slot pr. maintained power.

In the end it is possible, but likely not useful unless you are a fair bit stronger then the target.

Thank you for the response.

I'm aware of how splitting your potential works, but there's two things you aren't realizing: the advantage psychic ambivalence (+5 * number of powers when using multiple powers per turn) and the courage mental pattern (automatically use a higher result with offensive powers,) that make this more viable.

Lets say I have +60 potential, and want to use mental restraint which I spent 1point to strengthen for another +10. Because I have +60 I can use the power 6 times at +10. However I get a +30 (6*5) potential from ambivalence and then a +10 for strengthening.

This means that I can turn one power at +70 into six powers at +50. Because of the courage mental pattern all six of these are automatically Medium difficulty (80 Psr) at worse, and if I roll better than 30 they're Difficult (100 PsR) because I actually need to hit a level of 40 or 80 and automatically bump it up.

This is all how this stuff works, yes? You don't need to maintain a power if you just use it again the next round, right? Because even if these results are a bit lower than I could by just using the power once, I feel that having to roll six times at slightly lower numbers is way better odds than rolling once with bigger ones, especially in the case of a power like mental restraint where each one that hits can do something different.

It is strong, maybe even broken, but the way I read the rules it should be allowed.

Remember if you don't maintain the power and lose initiative the next round you are in trouble.

Anima have a lot of these things that feel broken but the GM can usually play around any "one trick ponies" out there. Here is how I would counter it as a GM:

1. I would invoke the "limits subject's freedom" for +20 to the check if used in combat to limit my ability to attack.

2. I could use a nemesis char with matrix cancellation to punish many small abilities.

3. I would use a high initiative character to punish the -20 defensive projection.

All in all this is strong but no more overpowered the a lot of other stuff.

I thought ambivalence added to the total, not each individual power.

My math would be +60 potential split into 6 groups of +10, plus the +30 also split into the six groups, then add the +10 to each, then figure the courage. . .

So, shorthand:: (60/6) + (30/6) + 10 = 25 (then increase to next level) making 40 or Basic difficulty at worst. I don't have the page, so I can't say whether that changes anything or not.

Did I misunderstand?

Here is the direct quote from the example given in the GM book.

A mentalist with a Psychic Potential of 100 declares that he will
use three powers that round, dividing his bonus into +40, +35, and
+25 respectively. However, he also has Psychic Ambivalence, which
allows him to add a total of +15 to each, given that he is using three
powers, resulting in final bonuses if +55, +50 and +40.

3 powers = +15 to all three, you add the full bonus to every one

A small sidenode to your mental restraint example. You could use the same trick with the "Ballistics" power which would be incredibly overpowered so as a GM I would probably be careful when allowing this method to be used.