Sorrow

Sorrow is a rare +1 Glaive that grants its wielder the Sorrowful Lash cantrip as  Bonus Action once per turn.

For every drop of blood spilled, a piece of the soul perishes - until nothing remains but regret.

Properties

Damage: 1d10 + 1 (2~11) + Strength modifier ⁠Slashing
Details:  Glaives;  Rarity: Rare; Enchantment: + 1;  Two-Handed;  Extra Reach;  Dippable;  Range: 2.5 m / 8 ft;  Weight: 2.7 kg / 5.4 lb;  Price: 380 gp; UID
DEN_HalsinBlade

UUID
0de9e072-7048-4d07-8bbe-79e0591674c2

The holder of this item gains:

If you have proficiency, equip in main hand to gain:

 Brace (Melee) (): Spend 6 m / 20 ft of your movement. For the rest of your turn, roll melee damage twice and use the highest result. ( Recharge: Short rest.)

 Lacerate (): Slash at your target's vital points to make it Bleed. ( Recharge: Short rest.)

 Rush Attack (): Charge forward and attack the first enemy in your way, possibly pushing them Off Balance. ( Recharge: Short rest.)

Hidden Vault X: 183 Y: -82: On a stone slab at the Wolf altar in the Hidden Vault

The altar is unlocked by solving the Enclave Library Puzzle in the Druid Grove.
The  Druid Notebook beside  Halsin's bed implies that Sorrow first belonged to  Ketheric Thorm.
All characters besides the Dark Urge comment when picking this glaive up for the first time.
The attack roll for the  Sorrowful Lash cantrip uses the Spellcasting Ability of the player character from the moment this weapon was equipped. However, its damage uses their current Spellcaster Ability Modifier. Therefore, if a character respeccs without ever having changed to another weapon, this results in attacking with their old Spellcasting Ability while damaging with the modifier of their new one. To remedy this, Sorrow must be unequipped and re-equipped.