Xanad increases the hero's stats if:
1. The hero is level 10 or higher;
2. The hero is level 8 or higher and has the "Diplomacy" skill;
3. The hero is level 6 or higher and has an advanced level or higher of the "Diplomacy" skill;
4. The hero is level 4 or higher and has an expert level of the "Diplomacy" skill.
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