Hell Razor

Weapon (longsword), very rare (requires attunement)

This sword was intended to kill in one slash, but generations of being used by vain knights has tainted its intent.

Divisive Slice. When you hit a creature with this weapon, you can choose to deal an extra damage dice. Upon doing so, your current and maximum hit points are reduced by 1. Healing magic of 6th level or higher can reverse this effect, restoring your lost maximum hit points by an amount equal to the spell slot's level. This restoration can only happen for maximum hit points lost from this item; restoring lost hit points from this item and another require separate castings.

Eternal Reminder. Scars from this weapon never fade. If a scarred creature attempts to alter its appearance through illusion magic, the scar is still visible through the magic.

Perfect Cut. This weapon allows you to cast disguise self at will, using Charisma as your spellcasting ability When cast in this way, the spell doesn't require concentration and lasts for 1 hour. Truesight, antimagic fields, and other effects that negate or see through magic have no effect on illusions cast from this weapon as long as you still resemble yourself after the casting.