Obsidian

Obsidian is an immaterial, shape-changing weapon weaved from the fabric of shadow itself. Obsidian and its wielder can never be truly separated; the wielder can summon and unsummon it at will. Obsidian can also never be destroyed.
Obsidian seems to be tied to the god Obsis, as it can only be attuned to by his chosen. The wielder of Obsidian can make psychic contact with its previous wielders, who take the form of shades.
Obsidian seems to have a connection to another weapon: Nightshade.

Item type

Weapon, Other

Current Holder

Soora Huinë

Obsidian

Weapon

Legendary by Obsis' chosen only Requires Attunement

You have a +2 bonus to attack and damage rolls made with this magic weapon. While attuned to this weapon you add +5 to all Stealth checks. This weapon is immaterial, weaved from the fabric of shadow itself. You can never be truly separated from it and can summon and unsummon it at will. It cannot be destroyed. Whenever you roll damage for this weapon, including sneak attack and similar features, you may reroll any 1s and 2s. When you reroll dice in this way you must use the new roll.

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Shadowstep: As a bonus action, while in dim light or darkness you can teleport to another space in dim light or darkness that you can see within 60 feet.
The Terror: Whenever you land a critical hit with this weapon the target immediately becomes Frightened of you for 1 minute. If the creature ends its turn in a location where it doesn't have line of sight to you, the creature can make a Wisdom saving throw (DC 17). On a successful save, the effect ends for that creature.
Obsidian's Price: When you die while attuned to this weapon it consumes a piece of your essence and grows stronger. Its power will grow and reveal new traits and characteristics at that time.

Type	Damage	Damage	Range
None	1d8+18	Piercing	150/600 ft