Noun which may take the genitive case particle 'no'
certified (as genuine, valuable, etc.); guaranteed (article)
see 極めつき
それは残酷な運命の極めつけの例である。It's a perfect example of cruel fate. of established reputation; acknowledged; recognized; acclaimed; notorious
Noun
pièce de résistance
Colloquial
Also written 極め付け【きわめつけ】