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Yeah, but what's the point of artifacts if they don't carry over to the next scenario? I think that would be too much, though.
In the last mission, they offer an artifact as a bonus, +3 to attack. Basically, if you managed to level up Zephyr to at least 12-13 attack, it makes sense to take it instead of the 6 Titans, which aren't very useful. I took the Titans, and now I regret not taking the artifact.
Do you mean you defeated 6 waves of enemy heroes? So, they systematically attacked you right after you captured the first Castle of Haven? Or were all 6 of them just hanging around nearby?