Did you talk to the Lich - did he ask you to destroy the heart, did he tell you where to look. Maybe it is the ring of saints all over again (ie no quest, no article waiting). Did you short-cut the conversation with the long winded NPC? That is the only thing I can think of - that and the "Are you in the right place?" - it is way up the top, and you used a very tall lift to get there?
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