Codex: Chaos Space Marines (2002), p51 — The Book of Nurgle - The Lord of Decay

Manreaper

This rusted and corrupted blade has been dipped in the filth seeping from the very throne of Nurgle, and in so doing absorbed the essence of one of the Daemons that cavort there.

The Manreaper is a two-handed power weapon in the shape of a scythe. With each sweep the long blade can cut through several enemies. The bearer gets +D6 extra attacks to reflect this. If the Manreaper's wielder directs his attacks at a single enemy model he will receive only one bonus Attack as the weapon is too long and unwieldy to be easily readied for further blows.

Codex: Chaos Space Marines (2007), p55 — Typhus: Host of the Destroyer Hive

Manreaper: This lethal instrument of death is shaped like a gigantic scythe. The Manreaper is both a Daemon Weapon and a Force weapon. Treat the Manreaper as a normal Daemon weapon, and in addition any model wounded but not killed by the Manreaper can be killed by Typhus with a successful Psychic test, following all the rules for a normal force weapon. Typhus may take this test even if he has used one of this psychic powers in the same turn.

The Tome of Decay (2014), p43 — Decaying Armoury

Manreaper (Daemon Weapon)

Iconic weapons of Nurgle's greatest champions, Manreapers are the Daemon-infused relics of the Death Guard Legion. Many Plague Cults go to great lengths to acquire or even forge their own, and the Daemons that inhabit these cruel weapons draw power from the filth surrounding the Plague God's throne.

A Manreaper is a two-handed Daemon Weapon with Willpower 57 and a Binding Strength of 3. It has the Accursed and Herald of Decay attributes. Whenever the wielder makes a Charge or All-Out Attack Action with a Manreaper, he may inflict a single hit identical to the first on one additional target in range for every two Degrees of Success he scores on the Test after the first. A Best Craftsmanship Manreaper also has the Force Quality. Only those dedicated to Nurgle can wield a Manreaper.

†This weapon has additional rules. See full rules for more details.