The scythe can be crafted with two sticks and two iron blocks, in the same crafting shape as an iron hoe.
It can also be obtained with /scythe and given to another player with /scythe <player> (requires OP)

The scythe has a right-click ability:

• Consume a portion of your current health (default 1/3)
• Set the scythe in its activated state, with a cooldown as its duration

When the scythe is in its activated state, it has a left-click ability:

• Target and damage all entities in a radius around you
• This damage is based on the weapon's base damage, your current health and your maximum health