The shortsword grants the following benefits:

• You can speak, read, and write Abyssal.
• You gain a +1 bonus to attack and damage rolls made with this magic weapon. Immediately after you make a ranged attack with this weapon, it returns to your hand.
• Whenever you kill a humanoid with an attack using the Blade of Broken Mirrors, the blade remembers the creature’s appearance. While holding the dagger, you can use an action to change your form to match any humanoid the blade remembers. Your statistics, other than your size, don’t change. Any equipment you are wearing or carrying isn’t transformed. You can revert to your true appearance as an action. You revert to your true appearance automatically when you die.

When the Blade of Broken Mirrors attunes to a new wielder, the appearances of humanoids it has killed are wiped from its memory.