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Icon of the Mutator.
The Challenge the God of Destruction mutator reduces the amount of health all buildings are healed at the end of a night and also increases the time a destroyed building needs to be repaired, but also increases the score and XP by 20% if you win.
Buildings only heal 25% of their health points every morning. Destroyed buildings take an additional day to get repaired, but you get 20% more points and XP if you win.