This blade is etched with spiraling runic patterns. When you attune to the blade, its surface becomes blank as it sinks into your forearm, leaving behind its runes as a tattoo on your skin. As a bonus action you may speak the blade’s command word to call it to your hand or return it to your forearm.
Proficiency with a dagger allows you to add your proficiency bonus to the attack roll for any attack you make with it.