Blade of the Black Desert

Weapon (dagger), very rare

This obsidian +2 dagger is made of blackened flint graven with symbols of blackest evil.

As an action, the wielder can cause the weapon to grow a haft, allowing it to be wielded as a +2 spear or +2 pike. Evil creatures wielding a blade of the black desert gain a +2 bonus on Charisma checks with daemons.

When the wielder of a blade of the black desert scores a critical hit, the wielder can choose to inflict the target with a powerful curse called the embrace of Set (DC 15 Wisdom negates; see sidebar). If the target fails its save, the blade is destroyed after imparting the curse.