...but you don't really know that.
What you do know is that people who are sensitive to detecting magic, such as aura sight, aura sense, and inherent ability to detect or feel magic, those people would have felt on the 257th day of the Second Age that some very strong and very dark magic took place somewhere in Lismore.
Those with extremely accurate powers of detection would be able to tell the magic was related to something to do with a dead person's soul.
OOC, someone has been brought back to life through necromancy.