Gandrel is still in the same spot near the hags house. If you didn't recruit Astarion, but have met him, you can rat him out to Gandrel. If you killed Astarion, you can tell Gandrel that and he will comment, that Astarion is hard to kill and probably not dead.
Thank you, fylimar! I wonder if Gandrels lines are a hint that seemingly dead characters might return later in the plot. Since someone seems to have an interest in the survival of our group (those with the special tadpoles), I have always been a bit surprised that killing any of these characters is possible.
But it would have been quite frustrating, from a roleplaying perspective, if you would not have the possibility to kill companions. There should be the possibility for killing or kissing or anything inbetween for each of them
