Well, I came back after I was dead and remained in Middle-earth for centuries. But it wasn't because I was called by a living person, it was because I refused to go when called by the Elves' Death God. But had it been otherwise, I'd never have harmed anyone who loved me, much less taken their body. Although I can see how it might happen that a soul could be under the control of some powerful living person or entity and forced to do their bidding.

I admire you for your courage in taking on this mission. Saving the trapped souls sounds really, really important.

This Earl sounds really nefarious and destructive.

You use methods that don't involve physical weapons? Good for you. You have powers that make it possible to free the enslaved souls, but the use of those powers shortens you life? Is that what you meant?