What if you added them with an Easter egg type of thing?
I think of that Deep Space 9 episode, Visionary, where Miles gets a nasty dose of Radiation, that lets him "see" into the future. Or the episode of Bhala, where Sisko gets a shock and is able to think and conceive of things, that lets him find a city lost to time for 10,000 years.
So, what I have in mind is that, you take this thing that "will" kill you, but it doesn't kill you immediately. You have to find out what Easter egg it unlocks, while you have the "debuff" and of course before it kills you.
That way, you'd have players that would see an obvious warning of don't do this, but then other players would realize you wouldn't put an obvious death thing in, unless it had a purpose, and now they are trying to find what that purpose is.
Kind of like the Pendant in Dark Souls. Though to be fair, there was one place no one bothered to check for its use and since no one was looking there, that is why I believe the developer said it was just a joke, so that people would stop looking.
... Alternatively, you could have something like a skill that increases called "Alertness" that is raised by deadly events, and helps to provide a "spiderman spidey sense" when it comes to detecting future dangerous events, so you don't do them... some of which could be tied to main story events. Like say the artifact in containment facility has a few options to interact with it, and some causes immediate or delayed death and one is safe, and choosing the wrong one means that the loop ends fairly fast.