Jungle Adventures: Do Marked For Death Relics Kill Sims?

My Sim has the marked for death relic and she activated it on a Sim and she got purple splotches on her face and started belching and that's it. I got the notification that she was marked for death but a Sim week later she was still alive. I used another marked for death relic on a Sim & it caused him to get electrocuted every so often but again, nothing. So do these relics actually kill Sims or are they just named marked for death? Has anyone used one and it did kill a Sim?