"I have no regrets."
As a mortal, standing beside his father, Andar saw the end of a universe while still inside it. This event was one of the pivotal moments in his life, and it showed him the inevitability of the end and the decline of all things.
There were those in Reality who were blessed or burdened with the power to persist for eternity, but aside from these few, there was a limit placed on everyone, even Old Ones, and today, he had reached the end of his road.
In the beginning, Andar struggled with this concept for a while, and even Rowan could not solve the queries in his heart because after conversing with his father, Andar discovered a frightening side to Rowan: He had no innate understanding of death.
It was not as if Rowan did not know that death existed; he was one of the greatest dealers of death that Andar had ever seen, but something about him did not acknowledge the possibility of it, and Andar had sensed that even as a mortal.