Leeches Soul Power from targets
The Pluton Scythe is a greatblade.
It is a greatblade variant that gives the player up to 5 Soul Power on hit. Holding it gives the user +2 Luck, which is the equivalent of the Luck II potion effect.
Pluton Scythe is currently unobtainable in survival mode. It can still be spawned in via Creative mode, commands, or other third-party methods though.