We have wood demon.
Wood demon is weak against fire.
And there we have usual offensive runes and fire runes.
To defeat a demon you need to roll at least 20.
Usual rune is -1 to this value.
Fire rune is -3 to this value.
Considering this there is a question.
Why did Monica buy 5 apples and not 3 chicken breasts after walking 5 km from these coordinates:
54°44'09.9"N 20°32'15.0"E
???