When it comes to lore, the first two Diablo games take a show-don't-tell approach, with most of the important information being hidden behind passing mentions or cryptic explanations. This opened the door for a variety of interpretations of the series' lore. Then came Diablo 3, which introduced a soft-reboot as well as a slew of retcons to the lore, inadvertently shifting the game's atmosphere from gothic horror to high fantasy in the process.

As a result, many inconsistencies in the logic and continuity of the Diablo lore were introduced as a result of this. Many inconsistencies can be found in a plot that revolves around Heaven and Hell fighting it out for a small speck of rock, but the Diablo series' shift in focus has significantly magnified the inconsistencies in the story. It is highlighted by the fact that Diablo 2's remaster has maintained its popularity to this day, despite changes to the lore and even plot holes that prevent the games from having a cohesive story.

Why does Diablo require a vessel in the first place?

– One of the reasons Diablo's appearances changed so frequently in all three of the current games is that his form is influenced by his vessel composition

– The first two were male, while the third was female, which explains the dramatic difference

– However, given how easy it is for other demons to manifest in their true form in Sanctuary, shouldn't Diablo be able to manifest in his true form without much effort as well

Both Belial and Asmodan made it appear to be simple. Meanwhile, Mephisto, Duriel, Lilith, and Andariel reappear in their true demon forms on the scene of the action. Diablo, being the most powerful of them all, requiring a vessel before manifesting in Sanctuary appears to be more of a plot device than anything else. When one considers the power structure, it doesn't really make any sense at all.

Diablo is a game that is constantly being revived.

1. Another point in opposition to the Lord of Terror's activities is that Diablo being resurrected or transported back to Sanctuary on a consistent basis becomes tiresome and defeats the narrative purpose of the first two games

2. It was understandable that he would keep returning time and time again

3. Because the second return was unprecedented, returning twice was tolerable

Tyrael, in particular, should have anticipated the third return a little more eagerly. Someone with his level of power could have imprisoned Diablo in the Void, just as Inarius did with Lilith, but he chose not to. Indeed, Heaven's forces were capable of accomplishing this while Diablo and his two brothers were still reeling from their defeat in Sanctuary.

The Nephalems' Mission Statement

The purpose of the Nephalem, or Sanctuary, was changed dramatically as a result of the Sin War books and the third game's introduction of the concept. Sanctuary and its Nephalem descendants / inhabitants were dwarfed in comparison to Heaven and Hell in Diablo 2, and even in the first game. This had a noticeable effect on the atmosphere, making it more gloomy and hopeless.

Because of the destruction of the Worldstone in Diablo III, the Nephalem's power dampener was removed, allowing the human inhabitants of Sanctuary the opportunity to rise to the status of demigods and challenge the powers of Heaven and Hell, respectively

1.  Meanwhile, it was never entirely clear what kind of changes the destruction of the Worldstone would have brought about

2.  In reality, its effects were ambiguous and did not appear to be something that humans would benefit from, at least not explicitly

3.  Due to this, factions such as Heaven or Hell are now considered cheap and easily overpowered

The Worldstone's Capabilities

The Worldstone is no stranger to powers that appear out of nowhere, and it has seen them all before

– Even after Tyrael destroyed the Worldstone, the developers of Diablo 2 never really explained what the Worldstone was for

– Generally speaking, it was regarded as Sanctuary's protective barrier between Heaven and Hell, something that kept it safe from harm

– The ramifications of Tyrael's destruction are incomprehensible, but they are far-reaching

– When it comes to filling in the blanks, it's usually up to the players' creative imaginations

Then, thanks to Diabo 3's retcon, the Worldstone was revealed to be nothing more than a power limiter (at the very most). In Sanctuary, it prevented the emergence of Nephalem superpowers among the human descendants because both Heaven and Hell were concerned about what they could become. Furthermore, it was also a tool that allowed for the creation of new worlds, which is why both Heaven and Hell sought it out for their respective purposes. Therefore, an additional rule was introduced that stated that whichever side controlled the stone would do so for a millennium, which meant that Baal didn't even have to corrupt the stone in order for it to be corrupted.

Disparities in the Nephalem Hero's Strength

1. When you consider all of the changes to the Nephalem, it would be reasonable to assume that they were weaker before the Worldstone exploded

2.  The reality is that this is not the case, particularly in the first two Diablo games

3.  For the Nephalem to be victorious over the three Prime Evils, it was not even necessary for them to break free from the Worldstone's proverbial chains

In Diablo 3's timeline, that kind of achievement calls into question the newly discovered strength of the Nephalems. If their hobbled predecessors were able to do it, then the destruction of the Worldstone isn't going to make much of a difference. That only serves to expose the flaws in Heaven and Hell's justifications for attempting to keep Sanctuary open.