By receiving damage...

The only possible method is...

And neither does Gramps...

My current Mystic Code doesn't hold such skill...

We can't get out from this room unless I charge your NP!?

Can't get out from this room unless you charge NP

What's with this room!?

Thou mayest attack me

I'm really sorry!!

Once we're out of this room you can attack me as much as you like!!

I'm sorry Gramps!!