Originally Posted by xero

And even then, if the super guards are strong enough from the onset, it might not make it all that achievable. I don't know how powerful they are at levels close to 1.

At least from the ones I've seen, each level is 1m Inhibition. (If using Energy Drink, it's 500k for each level).

I haven't seen a Dark Airu under lvl 10 so I'm under the impression 10's the minimum level, though I could very easily be wrong.

Oh, and your chances of getting one towards a specified level are fairly (not necessarily but it'll need more data) random. Players can jump from lvl 90's to lvl 10's in a matter of minutes.