HEROES: The Heroes win the Scenario if before the end of Turn 8, they have either escaped with Princess Yasimina or Thulsa Doom is killed, and at least Conan and Subotai are still alive.
OVERLORD: The Overlord will win should the Heroes: Fail to steal Princess Yasimina; Valeria and Conan or Subotai are killed, or; Princess Yasimina dies before the end of Turn 8
May I suggest that if Valeria dies, the scenario is a draw, or the victory points for the heroes are reduced. If she survives, she’ll be present at the battle of the mounds, so in Scenario variant.
still not sure about this: Why should Yasmina be killed by the OL?