I think a more apt question is: You say a lot of people died in the event. What if generic NPC died but I don't want them to? (LIke my character's friend or something)
You can choose to have it... not affect them. Like say Ul'dah got poisoned. People could have drunk from flasks at the moment it was bad etc. They drink from their own stores.. they drank bottled stuff etc.
I don't think anyone is going to say Rauhbahn just got poisoned so... that's not an issue.
However if a Player Character has died they must have had some sort of Player consent. In which case you... can't do anything but accept that. If you don't accept the event as it is, tweak it. Or say "somehow. I don't know what, my friend was killed."
You can choose to have it... not affect them. Like say Ul'dah got poisoned. People could have drunk from flasks at the moment it was bad etc. They drink from their own stores.. they drank bottled stuff etc.
I don't think anyone is going to say Rauhbahn just got poisoned so... that's not an issue.
However if a Player Character has died they must have had some sort of Player consent. In which case you... can't do anything but accept that. If you don't accept the event as it is, tweak it. Or say "somehow. I don't know what, my friend was killed."