The Ehveline is a female Eldar figure that appears in the mythology of Craftworld Kaelor. It is in fact a variation of the classic mythic cycle known as the "Tears of Isha" where the Children of Isha were separated from the goddess Isha by the Phoenix King Asuryan in order to protect them from Khaine's wrath. The Kaelorian version, however, states that Isha kept one of her most cherished daughters hidden from the Phoenix Lord when the Eldar were banished from the heavens. According to myth, this daughter was raised in secret by Isha, who taught her the secrets of the universe but her power began to grow so great that it became impossible to hide her from Asuryan for much longer. Thus, Isha transported the Ehveline to the mortal realm where she was kept hidden and isolated amongst the Eldar of Kaelor for her own protection. This was to prevent her from suffering from the wrath of Khaine and drawing the suspicion of the Phoenix Lord Asuryan.
It is said that the Ehveline held an immortal soul that went through a cycle of reincarnations in the form of mortal Eldar bodies though always took the shape of a beautiful female with startling sapphire eyes. Legends suggest that the incarnations of the Ehveline will never appear to grow beyond their childhood since the daughter of Isha descended from heaven before being fully grown. The myth is kept alive amongst the Seer Houses of Kaelor which included the House of Yuthran where they proved to be an interesting legend and unique to this Craftworld.
A detailed entry on the Ehveline features in the glossary section at the back of the novel Eldar Prophecy.