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Time of day?
If we only had a time of day feature. Daytime attacks VS nighttime attacks. Day troops more aggressive during light. Dark troops more aggressive during night. Bases could defend by adding lights to key locations to weeken or strengthen day troops during a dark battle. Or a sun spell or eclipse spell could be cast to cause total chaos! Lvl 6 troops can carry torches to light raids. Or the king or queen may have that role at lvl 10. It would create a whole dynamic. Based on the clash of clans world clock of course.