Executioner is a recurring skill in the Dragon Quest series.
A stronger version of Hatchet Man, Yangus can learn it by investing 66 skills points in the Axe skill tree, and is useful for hunting Metal slime monsters. It ditches the chance for a normal attack for a 50% probability to land a critical hit. It costs 3 MP to use.
Now a Pep Power, it is used when Sylvando and Hendrik are Pepped Up while also having Hatchet Man and Metal Slash as abilities. When used, it always lands a critical hit, which is great for Metal slime hunting, as well as strong opponents. This Pep Power is required to officially defeat Tweedledoom and Tweedledeath in the Kingsbarrow.