Ruin's Wake

Ruin's Wake is a spear and one of the Arms of the Betrayers created by Gruumsh from the soul of a balor named Yarrowish. As a sentient weapon, it has a Chaotic Evil alignment and can communicate with its wielder telepathically. Similar to a Vestige of Divergence, Ruin's Wake progresses through various stages as it is wielded and gains new properties, including giving its wielder the ability to grant themselves and allies advantage on attack rolls, regain health by slaying their enemies, and summon lightning.

Description
Ruin's Wake is a spear made from the bone of an ancient gold dragon. It has an hymn to Gruumsh written in Orc carved into it. The spear was made from the soul of the balor Yarrowish, who encourages violence as the solution to all problems. Ruin's Wake can hear up to a range of 120 feet and has darkvision for the same range.

Properties
Like all Arms of the Betrayers, it progresses through stages—dormant, awakened, and exalted—and becomes progressively more powerful as it is wielded. Each stage has all the properties of the previous stages.

Dormant state

 * One random minor beneficial property and one random minor detrimental property.
 * The wielder knows Abyssal and Orc.
 * The wielder has a +1 bonus to attack and damage rolls made with this weapon.
 * On a successful attack, the weapon deals an extra 1d8 piercing damage.
 * If used to make a ranged attack, the weapon immediately returns to the wielder.
 * When hit with a melee attack, the wielder may use a reaction to make a melee attack using the spear with advantage. This cannot be repeated until the wielder completes a long or short rest.

Awakened state

 * One additional random minor beneficial property and one additional random minor detrimental property.
 * The bonus to attack and damage rolls increases to +2.
 * The extra piercing damage increases to 2d8.
 * The wielder may speak a command word while throwing the spear, transforming it into a bolt of lightning. The lightning moves in a 5 foot wide line from the wielder to a visible target within 120 feet. Every creature within the line excluding the wielder must make a Dexterity saving throw (DC 15). On a failed save, the targets take 8d6 lightning damage, on a success they take half as much. This cannot be repeated until the next dawn.

Exalted state

 * One random major beneficial property.
 * The bonus to attack and damage rolls increases to +3.
 * The wielder may use a bonus action to release a battle cry, granting all chosen creatures within 30 feet of the wielder advantage on attack rolls. This advantage lasts until the start of the wielder's next turn. This cannot be repeated until the next dawn.
 * If the wielder reduces a creature to 0 hit points with the spear, they can regain a number of hit points equal to the damage dealt. This cannot be repeated until the next dawn.