Item from Undertale / Deltarune by Toby Fox
The strongest weapon in Undertale — found only on the Genocide route, belonging to the first fallen human. Its description: 'About time.'
The Real Knife is found in Asgore's home on the Genocide route — the same location where you find the worn dagger on other routes. The name change tells you everything: on Pacifist, it's a 'Worn Dagger' described as a garden tool. On Genocide, it's the 'Real Knife' and its description is 'About time.' As if it was waiting. It belonged to Chara. It is the weapon you use to end the game. The dual naming is one of Undertale's most elegant design choices — the same object means different things depending on who you've become.
A simple knife. Nothing ornate, nothing special. It is terrifying because of its simplicity — it is the weapon of someone who doesn't need theatrics, just results.
Also known as: Worn Dagger, Chara's Knife