So Weird1999

Fi:
Give me my brother back, please.

Bricriu:
Oh, dear girl, all you need do to be rid of me is to say in a loud, clear voice "Be gone from this mortal form."

Fi:
Be gone from this mortal form.

Bricriu:
Hmm... try it louder.

Fi:
[shouting] Be gone from this mortal form!

Bricriu:
Come now, girl, give it some oomph!

Fi:
[shouting] Be gone from this mortal form!

Bricriu:
[laughs] I'm sorry, I forgot one small detail. It doesn't work unless you invoke my one true name.

Fi:
What is it?

Bricriu:
Ah, therein you see lies the sweet spunkie's game. I'll give you a go at guessing my name. Though measured in seven, no more and no less, choose well, me lass, for you've only one guess. You have until I've finished absorbing Jack's memory.

Fi:
How am I supposed to guess your name? It could be anything.

Bricriu:
A hint: it's not Rumpelstiltskin.