“Drawing a bow means taking and losing lives. But Father, if I do not take a life... If I do not take a life, I cannot go on living.”
The words of god conveyed to Yona through the priest Ik-Soo are to find the four Dragon Warriors of Kouka Kingdom's Legend of the Four Dragons.
The warriors who inherited the dragons' blood
...المحاربون الذين ورثوا دماء التّنانين
Die Krieger, die das Drachenblut erbten,
Los guerreros que heredaron 
la sangre de los dragones
Los guerreros que heredaron 
la sangre de los dragones
Les descendants des quatre dragons
ont mené leur vie indépendamment
I guerrieri che hanno ereditato 
il sangue dei dragoni
Os guerreiros que herdaram 
o sangue dos dragões