Sensenmann is a mod for registered Wolfenstein, made by Mäx. It was released on April 9, 2004.
The mod's title roughly translates as The Grim Reaper, and the protagonist indeed brandishes a scythe.
Three months in the works, the mod was lauded upon release as being a well thought out horror-themed mod with many coding changes, such as floor and ceiling textures, outside atmosphere, a motorbike and new weapons.
20 new levels are featured, spread across six episodes, with some episodes containing secret levels.
The mod features quite a number of Blood sounds, music, textures and assets, and even uses Caleb quotations (over-riding various game sounds) and face in its HUD; it also borrows quite heavily from Doom including textures, sprites and enemy from the game.
Furthermore, characters from the Freddie vs. Jason franchise appear as well.
The title screen was based on that of Kristallnacht.