必殺

1. Origins, structure, and basic meaning

• Structure: 必殺 (ひっさつ) is a modifying noun for a decisive move intended to finish an opponent in one stroke.
• Basic usage: 必殺の一撃 modifies the finishing blow that defeats a monster, while 架空の必殺技 forms a compound for imaginary special moves named by children.

2. Common pitfalls and similar expressions

• Finishing blow and fictional technique
  • 必殺の一撃 and 必殺技 occur in comic and play contexts. 必殺 should not be broadened into a claim that real killing necessarily occurred; the focus is a decisive finishing technique.