Wicc
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Well, AA is overpowered everywhere... especially with the red orb... the bonus to morale isn't the main thing there.
Artifacts that reduce morale, as well as an abundance of diverse lock-picking creatures, are specifically designed to increase the importance of leadership and artifacts that boost it. Usually, in Shades of Darkness, this aspect is ignored (except in unrestricted rules); leadership is a semi-useless skill there, and artifacts for it are usually not equipped for the final battles. In Heroes, it's different.