Robert the Olidamarite, a hulking, light hearted, half ogre passes by, and hears mention of riddles... for gold no less!
"Ah! Riddles, I do so enjoy a good one!"
Upon hearing obsidians third riddle, he puzzles for an answer.
"I serve by being devoured, thin I am quick, fat I am slow... what am I? Hmm..."
"What has a life measured in hours? I'll take.... water? Yes. my answer is water."
"And to answer your last riddle, the sun. In a dungeon, it'd be a blessing to catch so much as glimpse of the sun. But, on the surface, when the suns it's hottest and at it's apex, it can be truly a hell."