Firewall

The Firewall is a hardmode accessory that increases defense by 4, as well as providing immunity to knockback and granting the player dashing abilities. Upon dashing, the player will leave a trail of green binary for aesthetic reasons. When the player collides with an enemy whilst dashing, the player will be reflected back, similar to that of the Shield of Cthulhu.

Trivia

 * A Firewall is a protective computer program that defends the host against malware.