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Here are some shorter options:
1. You all die.
a) New characters are created, and a different storyline begins.
b) I complete the islanders' quest, and that's the end.
2. You win. There are a lot of corpses among the players' characters. ???
3. You surrender.
a) The storyline takes a slightly different turn than originally planned.
b) See the second sub-item of the first item, provided that the game has become boring (like for Nebka, for example).