There are a couple of unobtainable scythes that are only accessed from the creative menu.

-7 Unobtainable Scythes that are obtained through the creative menu.

-7 Craftable scythes that all have custom powers.

Uncraftable Scythes

Grace: Right click to fire a wither skull, and anytime you hit a mob, it grants you strength.

Nannas Scythe: Right click to grant Instant health for 20 seconds

Broodweavers Sickle: Mobs hit with this weapon are given the poison effect

Eager Edge: Right click to smite any entity within 20 blocks of you

Humility: WIP

Sol of Frost: Mobs hit with this weapon are given the slowness effect

Tidepod Terminator: Mobs hit with this weapon are granted the levitation effect for a very long time.

Craftable Scythes

Flame Scythe: Right click to fire a ghast fireball

Enderman Scythe: Right click to teleport 15 blocks in any direction you are facing.

End scythe: Right click to fire the ender dragons fireball

Nitrosis Scythe: Right click to summon a lava source block on the block you are standing on.

Scythe of Purity: Mobs hit with this weapon are given slowness, weakness, wither, and blindness.

Golden scythe: Right click grants the user 7 more hearts for 10 seconds

Voidling scythe: Right click to fire a fast, piercing arrow in the direction you are facing

Vispura Scythes [FABRIC/FORGE]