The Dreadblade is a post-Dreadknight weapon, the most powerful in the game. It can be obtained by killing the Dreadknight. However, if you are on legendary mode, you can get the Dreadblade by killing Helvius. The Dreadblade can be used to kill Weeping Angels, which drop the Angel's Tear.
The Dreadblade does 20 base attack damage, with a new enchantment called "Bleeding". The more damage you do in a short amount of time, the more likely you are to fill your bleed meter. Once the bleed meter is full, you will do double the attack damage for one hit, then your bleed meter will reset. There is no cooldown to this. The Dreadblade is unbreakable, enchanted with knockback 3, sweeping edge 3, looting 5, and fire aspect 2. The Dreadblade also increases your base speed, stackable with the Neptunium Bow.