i used to hate enma with passion under the assumption that it's a magic sword that helps zoro draw forth more haki than he normally could, but chapter 1033 cleared the misunderstanding, when it turned out that zoro can do the same thing himself, if he wasn't held back by the possibility of death.
now i kinda like it.
it is a sword with a powerful disposition that can only be wielded by a conqueror who doesn't fear death.
asura welcomes suffering, and enma welcomes death, the one who masters both death and suffering is worthy of the name: king of hell.
chapter 1033 flashback started with kouzaboro explaining the meaning of the word sunatchi: a magic word that summons strength into your heart.
chapter 950 flashback the kuri samurai explained that when people value themselves too much they turn into coward who take no risks, so in order to gain courage they have to surrender their names and be as children, and leap before they think.
to appease enma zoro needs to go all-out with haki, zoro was always holding back on that front because it would kill him.
then zoro realised that the thing he was avoiding is exactly what he should do all along, aka going all-out with his haki. he didn't need a magic word to arrive at that conclusion, he didn't need to throw away his name, in fact he shouldn't throw his name because he wants his name to be so great.
zoro unleashed his full power which brought forth his conquering spirit, this time around he is willingly giving enma his full haki, and he also does the same thing to his other two swords, establishing himself as one of the mightiest warriors in the world, the select few capable of infusing things with conqueror's haki.