The hilt is cold to the touch. Dhann notices the intricacies in the carving into the bone, like scrimshaw on fine ivory. The depictions are of beams of light radiating from the gem in the center. It is heavy but perfectly balanced, and, physically, is a perfect fit for Dhann. He sends to Elminster, hoping for more information: "Were you supposed to give me the Sun Blade when we first met, first met? Or at Mirt's? Not sure what you meant. Thanks."
The mage responds with an audible chuckle: "Been carrying that around to give to you for years. When we first met would have been a much better choice. But I'm old. I forget."
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The hilt of this particular blade was given to Dhann by Helm. Delivered to the Cleric by Elminster Aumar, the mage has apparently carried the hilt for a long time before giving it to Dhann as instructed. When attuned to it, the Cleric is able to summon a blade of pure Radiance.