All-Black the NecroSword

Ever wanted to wield void god Knull's symbiote sword from Marvel comics? Well, now you can, with this simple-yet-effective Minecraft addon! When you hit a mob, the sword deals Wither damage to your opponent, along with a hefty amount of base attack damage. You can craft All-Black with the crafting recipe shown, as well as place down and pick up All-Black like you would an armor stand.

(DISCLAIMER) the second image with Knull on his throne with All-Black on a Codex was made using multiple other addons, the main 2 being Mr. Nido's Spider-Man Addon and a resource pack that retextures the Sculk blocks to look like Venom symbiote mass (pretty sure it's called Sculk Venom or something like that)