Bethesda wrote:Demo, how does using an Elder Sign work when one (Aestrix/Carolyn) has only 1 Stamina? Or 1 Stamina and 1 Sanity, if all does not go well?
From p. 18: "The player removes 1 Sanity and 1 Stamina from his investigator sheet. This may knock the investigator unconscious or drive him insane, but the elder sign still takes effect."
If you pay your last Sanity or Stamina to use it, you remove it from the game before calculating how many items you must discard. You're sent to the Hospital or the Asylum, but the gate is closed and sealed, and you keep its trophy.
If you pay your last Sanity AND Stamina to use it, you are
devoured. You discard all of your cards, but keep your trophies, including the gate you just closed and sealed. During upkeep on the next turn, you draw a new investigator and do setup.
If you're Carolyn Fern, of course, you can also wait in the location with an explored token for an upkeep to pass before sealing the gate. This may or may not be tactically sound. The timing of the whole deal happens to make it very unlikely that Carolyn Fern (or the investigator who restores Health at upkeep) would be
devoured from using an Elder Sign in the first place, also: Carolyn would have to somehow lose Sanity between Upkeep and closing the gate without gaining Stamina, and I can't think of any way that would happen aside from failing a Heal that wouldn't be a good idea to cast in the first place.