Borealis

The Borealis is a Hardmode sword that is a direct upgrade to Aurora. When swung, it fires a small Borealis sword that spawns multiple Bysmal Blasts on hit. Each one will spread outward, then fly towards the cursor. These projectiles disappear after one hit and pass through walls.

While in Etherial Dimension after Etheria has been defeated, Borealis' projectiles spawn twice as many Bysmal Blasts on hit.

Trivia

 * Borealis is a reference to the phenomenon Aurora Borealis, also known as the northern lights, as it requires an Aurora to craft.
 * Borealis is Latin for "northern" or "of the north".