Okay, I feel a bit awkward because I LITERALLY just joined this thread, but just from reading old posts I want to see it resurrected, so I'm posting a riddle. It's not a rhymed riddle, but it makes great use of punning (that's your hint) and you'll have the best luck if you're up on your trivia from books 3-5. I don't think it's that great, but it's all I've got (I think it gets easier with each new stanza, so try solving from stanza one and if you need more hints progress through each one). Here goes:
Masks I wear many,
But not many see behind them.
Except by those dark as the one I despise.
I hate and I fear One of whom I will not speak
Yet I throw myself continually at his feet.
I am continual.
When all other hope is gone, I remain.
Those I defend I do not love,
And those I fight I cannot hate.
The one who hates me most
Is the one I will die to protect.
WHO AM I?