From the Super Mario Wiki
Death's Scythe is a weapon often used by Death in the Castlevania series, appearing as an item in Super Smash Bros. Ultimate. It can be picked up when it is spawned and used as a weapon; when used, the user winds it back for a brief moment before swinging it in front of them. When the user charges a smash attack with this weapon, a dark aura surrounds any players who have taken a lot of damage; if the user hits those players with the smash attack, they are instantly KO'd.
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