By speaking with Rolan in the Druid Camp in Act 1, Baldur's Gate 3 players learn that a powerful wizard named Lorroakan is looking for something called The Nightsong. By the end of Act 2, players understand what – or who – the Nightsong is. Finally, by Act 3, players can find Lorroakan himself – and learn of his intentions with the Nightsong.
Baldur's Gate 3: Should I Side With Nightsong Or Lorroakan?
In Act 3, a choice is presented in Baldur's Gate 3: side with the legendary mage Lorroakan and subdue Aylin, or help the Nightsong kill him.