Arenil
From Syra D&D Wiki
Arenil was an elven sorcerer that accompanied Zephyr Silverleaf on her journey to Brightstone Keep, and then proceeded to accompany Balon Stonehelm, Leardon Sunflare, Tol Sigurn, Justin Oakenleaf, and Zigil on their journeys. While sailing to the island of Lorius, they came upon a ship that had been attacked by demons. The crew had been brutally slaughtered, except for a young female half-elf who had hidden during the attack. They took her back to their own ship, where she and Arenil quickly became attracted to each other. A few days later, she cornered him in his cabin for a romantic fling. When he leaned in to kiss her, she transformed into a succubus and drained him of his life force while a trio of her demonic allies kept his companions busy on the deck.
Though he was brought back to life when the ship arrived at Lorius, he had lost nearly all of his magical ability and chose to return to his family.