The Nebula Arcanum is a magic weapon created with 18 Nebula Fragments, which are obtained by destroying the Nebula Pillar. The Nebula Arcanum summons a large purple projectile that homes in on enemies, and stays active for around 10 seconds. The projectile can kill multiple enemies one at a time because of it's long active time. Once the projectile has expired, it explodes, which can deal even more damage to enemies. When equipped, the Nebula Arcanum will appear in front of the character, as if holding it like a crystal ball.