The defense tower obtains corresponding bonuses in different time periods according to its five elements attributes. Players get the corresponding Yin and Yang attribute bonuses in the day or night according to the selected yin and yang attributes, which act on the towers. The monster wave impacts the player's castle, and the castle increases its health and various defense bonuses of the tower through rune technology. All the towers on the map after the castle is broken will be destroyed and the game will be restarted. The level of the towers on the map is fixed. The towers that have been placed will not be upgraded after the towers are upgraded.