"His clothes had been formed from a single bolt of white fabric -not a robe, not a dress, but rather something in between, pleated and draped over his muscular body. A golden cuff of an upright serpent encircled one powerful bicep, offsetting his near-glowing dark skin, and a radiant crown of golden spikes -the rays of the sun, I realized- glistened atop his onyx hair.
The sun personified. Powerful, lazy with grace, capable of kindness and wrath. Nearly as beautiful as Rhysand. And somehow-somehow colder than Kallias. [...] But perhaps the physical power of him was the sleight of hand.
For Helion's other title was Spell-Clever, and his one thousand libraries were rumored to contain the knowledge of the world. Perhaps all that knowledge had made him too aware, too cold behind those bright eyes."
Helion, High Lord of the Day Court, from A Court of Wings and Ruin, by Sarah J. Maas