Magic Weapon (Any Melee Weapon), Legendary, requires attunement
This weapon is completely made of obsidian pieces that float together, forming any weapon.
Magic Weapon. The Shattered Sword has a +3 to all attack and damage rolls made with it, does an additional die of damage on a hit, and scores critical hits on a 19 or 20.
One Weapon, Many Forms.. While originally appearing as a longsword, as a bonus action, you may mentally rearrange the pieces to form any melee weapon you are proficient with, gaining the properties of that weapon.
Obsidian Assault. Once per short rest, you may turn any missed attack into a hit instead, or you can turn an ordinary attack into a critical hit.
Obsidian Assault (____)