And Lists All Those Insights About Him - Tumblr Posts
Reading through the datamine looking for something and I came across this in the file where a spawn Astarion gets burned by the sun at the end of the game.
If Astarion is not the player (i.e. he has run away already):

Nightwarden Minthara: Astarion is cursed to flee the sun as I am cursed to walk in it. Do not belittle him with pity - he is a survivor, and will thrive upon what bounty the darkness provides. There is life in him yet.
If Astarion is the player (i.e. she is talking to him):

Nightwarden Minthara: You are beginning to blister, spawn. Best scurry back to the shadows.
She's two faced in the exact opposite way that people usually mean when they use that word. She may be nice to you behind your back, but by god will she never let that slip to your face (unless you are her partner).