Frankly, Loimos was actually doing much more than just taking onto the burden of the new rule imparted into the realm by the emerald folks, by making use of his soul depth manifestation to connect to all over the undeads present within the realm, he had also channelled his powers to also shoulder the natural effects of the realm as well.
The undead should be far more limited, and most would have their respective ways of power locked away from being used, but thanks to Loimos, all of them could move and fight like they could in the main world, simply without the added benefits of being surrounded by death force and miasma, but that was something all had been prepared for.
In truth, Loimos was even more weakened than the fire knight believed, but it simply did not show, because even with all of that stacked on top of one another, he remained a formidable being, he definitely wouldn't be able to fight the pure living again like this, but that was beside the point.