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Amidst the Undead Army, aside from the feeble Skeletons, the flammable Undead, and the slightly stronger Skeleton Knights, there were a threat that had been advancing slowly, mostly because they were incapable of getting here in time. Their size and physical strength alone put them almost at D Rank in terms of monster strength, where Skeletons and Zombies are F Rank at most and the Skeleton Knights E Rank.
These are… Rotten Giants. Monstrous beings made up of many rotten corpses and bones stitched together through advanced Necromancy. It wouldn't be a lie to say I've fought several of them through my past life, mostly due to confronting many Necromancers through the Galaxy who sought my Vampire Body, which had always seemed to be a high ranked material for Necromancy.