Editing MidHammer 40,000 (section)

=Xenos=
Just like in regular 40k, xenos play a big role in the galaxy, but unlike regular 40k, the fact the Emperor is still around means Mankind's contempt and hatred for most things alien doesn't devolve into utter xenophobia, which can smooth things out through diplomatic relations. This relative peace is due in no small part to the intimidation factor that any xeno with half a brain and self-preservation instinct can see that the Imperium, despite its political schism, is far from weakened and vulnerable.

===Eldar===
With the Emperor still around, and the threat of Chaos considerably smaller than in the OG 40k, the Eldar may go two ways: either they are as uptight as ever, and thus be hunted down in any of their form, or they become some sort of shady on-and-off ally for the Imperium. In the first case, the Emperor knows that Eldar souls are quite powerful and feed chaos when improperly stored, so exterminating them all once and for all and collecting their Soulstones to protect them from destruction (the Eldar do have a weird habit of getting themselves killed) might stop them from feeding Slaanesh, and thus might starve one of the nastiest of the Chaos Gods. Considering the Emperor is still alive and Magnus is still loyal, the Imperium probably has semi-stable access to the Eldar Webway, and enough firepower to threaten Commorragh itself. Then again, the Human Webway is still a project worth consideration, given that Magnus' psychic phonecall never ruined it, so the Emperor may negotiate with the Eldar in exchange for Webway knowledge, as well as to help fight Chaos, Tyranids and many other threats. One of the most important things the Imperium can offer Eldar is safe passage when their people end up cut off from the Webway for one reason or another.

Curiously, some Eldar have made mention that something is "wrong" with reality and that "pieces are in the wrong places on the board".

Another possibility: The Dark Eldar are far, far fewer in number, and the supposed vileness and danger of Commorragh is mostly a ruse by the Drukhari Archons and their minions. The majority of the realm is just a mishmash of rundown dwellings and strange, barren streets; Commorragh is a ''slum.'' Most of the Eldar dwelling within, though called Dark Eldar for having fallen from the Craftworlds, are not spike-bearing sense freaks. The majority of them are instead sad, despondent space elves passing the time by either wallowing in mutual misery together, unable to go home and distraught at the practical death of their species and their civilization, or indulging in fairly minor pleasures such as smoke, drink and each other's company, many simply trying to push the awareness of the situation out of their brains. The events and troubles of the material plane are largely unknown to most Dark Eldar, as only few of them actually exit the Webway, and those few who do are usually Drukhari pirates and soldiers following the orders of the competing Archons, who are the "true Dark Eldar", being the ''worst'' specimens the Eldar species has left to offer and being more true to the OriginalHammer lore. Occasionally a Dark Eldar group may be approached by the Archons with offers of something worth living for in exchange for their service. Commorragh is actually quite habitable, and some Humans have been captured by the forces of Archons and then just either let loose when they stopped being fun playthings or somehow escaped, likely during a violent fued between Archons. The Humans have then been unable to exit the Webway and have simply ended up sitting around with the Dark Eldar slum-goers. Commorragh is, in essence, a spikier, quieter Underhive.

===Orks===
Some things never really change, and orks are not an exception. In MidHammer, orks are still a constant threat, but the more organized state of the Imperium means they can be dealt with much more effectively. The War of the Beast was much less damaging, although it still was quite a dangerous event.
Perhaps, though, the truly insane feats of survival that orks (or at least the ones with plot armour) seem capable of carrying out are toned down fairly heavily; orks are still tough, but not incinerate-my-upper-half-with-plasma-and-I'll-stomp-you-to-death tough.

Rather than Vulkan going solo against The Beast and sacrificing himself to slay it, Vulkan, Corvus Corax and Ferrus Manus took it on three-to-one and tore the bastard apart, though not without great effort and some lasting scars for their troubles. The experience is said to have brought the three closer together as brothers.

===Tyranids===
The Great Devourer still lurks around the galaxy eating planets, but there are many things that can challenge their presence in the galaxy. For one, the Emperor is alive, and while He can't really direct His troops personally against the 'Nids, He is still the most powerful psyker in the galaxy, and it stands to reason He can devise multiple strategies to mess with the tyranids' sense of direction and inhibit the hivemind's control, limiting Tyranid effectiveness even in large swarms. Not to mention Magnus is still loyal, and he could be one of the greatest assests Mankind has against the Hive Mind.

While the original death of Tyran still occurred despite the God-Emperor's cryptic warnings of the coming "herd", the battle for Macragge went far better than in OH with Guilliman going boots on the ground to fight alongside his sons and tearing the head of the Swarmlord off at the climax of a brutal duel with the mighty beast, giving the Hive Mind brain freeze and allowing his Ultramarines to rout the Tyranids and, by chance, discover that slaying certain Tyranids had an extremely pronounced effect on the larger swarm. The successive elimination of so many synapse 'Nids one after the other in such a short space of time utterly broke Hive Fleet Behemoth's attack and the Tyranids were exterminated from the planet and the sector. The ships of Behemoth were reported to have actually ''fled'' during the escalating rout, and the Hive Fleet has not been seen in Imperial space proper since. Roboute and his Ultramarines left a lasting impression on the Great Devourer, it seems. This is not to say they scared all Tyranids away; Hive Fleets like Kraken and Leviathan continue to reach into the Imperium to devour worlds, but the distinct colours of Behemoth are giving anywhere with Space Marines a very wide berth. And the Tyranid threat will not arrive in one all consuming wave of pure, undiluted sadness, but will be a bit more disorganized, and arrive in waves. Because there cannot be light at the end of the tunnel if you have been eaten by an endless tide.

===Necrons===
The Necrons are waking up after millions of years of rest, but instead of a galaxy fully embroiled in war, they find a damaged, but still strong Imperium, that could counter the slowly awakening Necrons before they become too dangerous. The Emperor may try to do something about the C'Tan shards, considering he has the Void Dragon prisoner on Mars.
Considering newer fluff, possibly tentative negotiations?

===T’au===
The T’au are mostly unchanged at their core, but the state of the Imperium means that the uncompromising “Join or Die” attitude of the Ethereals must alter  to accommodate not getting blammed immediately. They are a lesser threat to the Imperium’s eastern side than in OH (they are not a threat at all in OH to the point most Ordo Xenos Inquisitors don’t even know they exist), and barely constitute a thorn in humanity’s side. However, they are still a threat none the less, and more worlds have been lost to them than in OH (which makes no sense specifically because the Imperium in MidHammer is not a shithole), but this is not as bad as the Imperium has a much easier time compensating for this. They remain as totalitarian and hierarchical, and still trade with Imperial worlds and Rogue Traders on the border of Imperial space, though this is being cracked down upon after The Humbling of Guilliman.

The Damocles Crusade went absolutely horrifically for the Imperium, far worse than in OH. The inflexible Codex Astartes Chapters that got involved, including the Ultramarines themselves, were unable to handle such a tactically adept and technologically advanced threat without the Warmaster's leadership (which makes absolutely zero sense as the Codex Chapters became inflexible millennia after Guilliman was put in stasis, prior they were the most flexible of all). Roboute Guilliman, despite attempting to salvage the situation, was unable to prevent the loss of dozens of Imperial worlds to Tau occupation, under which they continue to languish to this day. The Damocles Crusade is often referred to as The Humbling, and has resulted in the Primarch resigning from the field to study and revise his Codexes in light of his failure. The Imperium continues to be in an unpleasant cold war with the Tau, having many more problems to deal with before full attention can be given to this threat.

Alternately: When the warp storm abated, Guilliman's people found the T'au Empire. The Lord of Ultramar saw in their technology a way to move the Imperium beyond its technological stagnation. He claimed their territory for Ultramar, making them a client state of the Imperium. The T'au resent this, but realize that overt action against the galaxy-spanning Imperium would be suicidal. The former client species of the T'au (Kroot, Vespid, etc.) variously see the Imperium as saviors who freed them from the T'au, a foreign power who can be played off against the T'au, or insolent barbarians who must be made to understand the Greater Good.

===Leagues of Votann===