The Raven Queen
Also known as: The Lady, The Lady of Ravens
The goddess of death, fate, and winter. Her domain is Letherna, a realm within the Shadowfell where souls pass through on their way to whatever comes next.
She called the party together. Each of them received a raven-delivered letter bearing the words:
"Dare much and the Lady will keep you."
Her shrine near Leilon — a small coastal structure bearing a silver disc with that inscription — was where you all first met.
Ubys serves her directly as a Cleric, receiving missions and dreams from her. What she wants from the rest of the party remains to be seen.