Terrarian's Last Knife

The Terrarian's Last Knife is a craftable post-Moon Lord broadsword. It returns a certain percentage of the damage done with each swing as life back to the wielder. When swung using right-click, it will swing slower but launch a massive blood torrent projectile with every swing, which travels through tiles and damages and pierces all enemies it contacts, at the cost of losing the life siphoning ability. The sword also emits particles when swung.