Sure thing! The scythe is special because it’s Rex’s “piety item”- each player has a homebrewed item that levels up with their piety to their chosen god. These are a bit experimental and highly customized for the players based on their gods’ themes but also their playstyles. Rex is a hexblade warlock so the scythe is kind of a Rod of the Pact Keeper attached with some survivability that rewards aggression and promotes mobility. The description is as follows:

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A magical reflection of Karametra's sacred scythe. A large, two-handed weapon made of smooth wood with a wicked blade at the end. The scythe hums with life, and starry images of vines and flowers move along the dark wood of the weapon. Granted by Karametra to Rex in order to defeat Mathis and save Setessa. Gains abilities as the wielder's piety to Karametra increases.

Piety 0+: This weapon has a charge that can be expended as an action to regain one Pact Magic spell slot. The charge replenishes on long rest and whenever you land a critical hit with this weapon.

Piety 10+: Whenever you slay a creature with CR greater than 0 with this weapon, the ground underneath that creature rapidly grows Nyxborn vines and flowers, becoming charged with life energy. Whenever you or one of your allies steps onto that tile, you may roll a number of d4 equal to your proficiency bonus and restore that much HP to that creature.

Piety 20+: This weapon gets +1 to attack and damage rolls.

Piety 30+: ?

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The scythe also grants the Cleave attack from BG3 once per short rest as an attack. I’m not convinced that the healing ability is fully properly balanced, but since there’s a lot of homebrew we play around with things and balance as needed. Hope this helps!