December reveals Ros's secret.  The party is shocked and glad to hear it.  But Ros seems unhappy, and December thinks he knows why.  He says that if Ros uses his power it will revive the Demon King, and so he orders Juli to attack again.
That might cause my 
grandfather to revive.
Eso podría provocar la 
resurrección de mi abuelo.
Eso podría provocar la 
resurrección de mi abuelo.
Isso pode reviver meu avô.