I agree with you completely, Talanthiar, far too quiet in the Riddle-Thread. Part of that is my fault I suppose, I haven't written any riddles in a long time. Just got back from vacation not too long ago, though, and I'm glad to see you've offered one up.
I'll wager a guess that the riddle is concerning Numenor. Heart of the given gift, hallowed then defiled, cleansed by wrath... all seem to describe it. The five peninsulas of Numenor all ended with the word "star", so I'll guess Meneltarma, the mountain at the heart of Numenor, which rose above the rest of the island.
By the way, I don't have much to do at work today, and you've inspired me. I think I'll see if I can work out a riddle or two.