Marvel did a great job when naming Gorr the God Butcher. Immediately, audiences know that this character not only kills gods but does so often enough to be labeled a butcher of them. This raises the question; how can one man be powerful enough to kill a god without being a god himself? Gorr achieves this by wielding a secret weapon that grants him this power, All-Black the Necrosword.
The All-Black is an ancient evil that was created by Knull, the god of the symbiotes, as a weapon known as Godslayer. The All-Black being a symbiote, possessed a mind of its own and when Knull was mortally wounded by another god, the All-Black sensed Gorr’s anger nearby and bounded itself to him.
The All-Black can take many forms and for Gorr it became All-Black the Necrosword. The All-Black also granted Gorr a list of supernatural abilities in the comics. First, he gained superhuman strength that allowed him to go toe-to-toe with Thor. Gorr also gained increased durability and speed that allowed him to react close to the speed of light. Like the most famous symbiote, Venom, the All-Black is able to manipulate itself to whatever its host desires, such as armor. Gorr also has the ability to generate and unleash blasts of dark cosmic energy. Thanks to the All-Black, Gorr is virtually immortal, having lived for thousands of years. It is not confirmed if all these abilities will be seen in the MCU’s version of Gorr the God Butcher.
Probably the most important trait of All-Black the Necrosword, and the reason it is so useful to Gorr, is its ability to dampen powers. The All-Black was created for the purpose of slaying vast cosmic beings. When being wielded, the Necrosword allows Gorr to wound beings who would otherwise be indestructible. While it may seem this symbiotic relationship only benefits Gorr and his thirst for revenge, it is important to note that with every god, deity, and cosmic being that is slain, the All-Black because more powerful.
All-Black the Necrosword is more that just the signature weapon of Gorr The God Butcher. Much like Venom to Eddie Brock, All-Black is the source of all of Gorr’s abilities. It is what makes him, The God Butcher.