After defeating the Vai'kesh in the outer cave, open the door to witness a
Vai'kesh ritual. Kill the Vai'kesh, then return to Lyssanore in Aman'lu and
teach her the chant. You'll get the Chant of the Dead added to your Lore
entries and you can now speak to all those uncommunicative spirits throughout
the land.
_http://faqs.ign.com/articles/644/644141p1.html
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