Lion Heart

The Lion Heart is a post-Moon Lord true melee broadsword that is sold by the Cyborg NPC for  after Polterghast has been defeated. When swung, an energy explosion is created on every enemy hit, dealing an additional 100% of the weapon's damage and inflicting the Electrified debuff. When used with the right-click, an energy shell is created around the player that halves all damage for 5 seconds, with a 45-second cooldown after the shield runs out.

Trivia

 * The weapon is based off the Lionheart, a Gunblade from Final Fantasy VIII and Final Fantasy XIV, though its design is far more akin to the former version.
 * The right click effect is based off a skill Gunbreakers can use in Final Fantasy XIV, called Superbolide, which negates all damage taken for a short time at the cost of reducing your HP to 1.
 * The energy explosions are based off the fact that Gunblades can release a large explosion on hit with a pull of its trigger.