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Bendlas is a shape shifter so look for a young girl to the west of Crest Castle.
Mymbyr will be in the Enclave First Floor if you have to talk to him again.
Kamber's Stronghold is in Silver Bay which is in the far southwest.
That;s your room. You get the key from Habren if you kill Kamber. If you kill Merlin, she won't give you the key.
A shape shifter is someone or something that can change their shape to another form.
If you have Omnur's quest to Kill Habren's Lover and the Core Revealing Scroll he gave you, tap this swan and a young girl should appear nearby. Talk to her and Bendlas should be visible near her.
It can't be sold. Maybe you stashed it somewhere? Otherwise, you'd need to go back to a previous save file.