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Speed wasn't just about combat; the Tower is generally a slow castle in terms of tempo – very often, until the end of week 2, everyone is running around with a speed of 6, with a maximum native speed of 11, and even that requires upgrading the Djinns, which isn't always done. This leads to slow movement on the map; many castles switch to 7-9 speed by week 1, or even start with 9 speed.