After getting through the fake wall, Loimos descended into the dark of the underground, from what he could tell, there had been a fallout of some sort between the soul depth manifestators and all others, leading to the former being imprisoned beneath the main building, and indeed, the skeleton could sense quite a few life forces down there.
Just before, his senses would have been too restrained to sense them, but it would seem that either the bloody battle above ground had reached such catastrophic levels of massacres that death was settling into the realm, or perhaps Loimos had simply gotten more powerful from his little face-off against Thanatok, it wouldn't be nonsensical, fighting his nemesis a second time certainly was bound to be an illuminating experience.
