A Fangorian Beginning
Keara is an elvish woman, only encountered first as a desecrated corpse in a barbarian camp, then as a ghost.
Keara was first encountered by the party before they were joined by Perrin, when they came across the desecrated corpse of a female elf on the alter to an unknown god in an abandoned silver mine which had been over-run by barbarians.
By the time the party had finished off the barbarians, they realised that the elven woman on the alter was long dead, so were simply forced to build a cairn, say whatever words of prayer or comfort they could and move on.
She then appeared to them later that night, to pass on information to them as well as to thank them for taking her revenge for her on the barbarian after she took the unheard of step of actually cursing herself as she lay dying, that being the only way she could think of to be able to at least remain in some form to try and take her revenge for the profanity performed upon her ruined body.