The 13

The 13 (十三) or Thirteen Enemies You Cannot See are thirteen ancient immensely powerful god-like beings, each of whom preside over a particular form of Egoism, Arrogance, Conceit, Selfishness, Greed, Lust, Intolerance, Anger, Lying, Cheating, Gossiping and Slandering.

Cultural References
The 13 is an allusion to the "Declare your jihad" of Al-Ghazzali.