King Eiddileg is very inhospitable.

Hint 1 of 7:

Make sure you tell him who you are.

Hint 2 of 7:

He'll ask for something to prove that you are from Dallben.

Hint 3 of 7:

The Fairies likes music.

Hint 4 of 7:

Maybe he would like a harp.

Hint 5 of 7:

Or perhaps a lute.

Hint 6 of 7:

Choose either item -- the game doesn't care.