I didn't say it's a specific attack.
If Law wants to perform useful attacks, he will have to incorporate them using awakening. That's a problem. Since awakening drains him heavily.
The same problem applies to Kid.
From what we've seen of their last resort, it doesn't look like it's enough at all.
How long do you think Kid can keep metal stuck on Big Mom?
It shouldn't be very long since it drains him terribly, right?
Either they get power-ups, or they fix the stamina issue with awakening.
They can't stay the way they are right now.