Terry Pratchett. The last hero (№ 22329)

- He fought monsters, toppled tyrants who stole a rare jewel, rescued maidens, - a vague have explained Better. - In short, a lot of heroic made...
But who determines the enormity of monsters and the tyranny of the tyrants? - asked Lord Vetinari in a voice that suddenly gained the sharpness of the scalpel, which is not as deadly as a sword, but bites into the most intimate places.
- Well, I suppose... a hero himself.