Monsters

Zombie: an undead formed from a corpse accumulating yin qi. Can be damaged using black donkey hooves.

Corpse Maggot: feeds on corpses and undead.

Ghoul: a misshapen humanoid undead found in the Abyss. It fears all things yang and craves all things yin, so it will not harm the living unless attacked.

Ghost: a person's soul that has absorbed a lot of yin qi. Obsessive and animalistic.

Bloodcorpse: A mindless undead that feeds on living and undead alike. Can transform into blood mist. At least Arcane Immortal realm.

Zombie King: a zombie that absorbed enough yang qi to form a new soul. Able to fight multiple Bloodcorpses simultaneously.

Grudge Corpse: Something recorded in only Lu Yun’s sect and found only in Skandha Extinction Tombs. No other tomb raider sect had records of it. The tomb creator used the corpse as a formation to gather all evil qi in the world to destroy the targeted clan. Imbued with an entire lineage’s worth of grievances, that hapless corpse would morph into a grudge corpse. As dangerous as a Zombie King.

Undead-spreading zombie: a zombie that can turn people into zombies via physical contact.

Undead Hag: an undead that is immune to the Five Elements, and is only vulnerable to Corpse Maggots.

Blood Dragon: an undead resembling a dragon. Brings disaster and misfortune wherever it goes. Can create and control a sea of blood.

Juba: a majestic spirit with dragon blood in its veins. According to legend, it was descended from Baxia, one of the nine sons of the Dragon King. Just like its progenitor, its rippling strength could move mountains and seas. It can change size, and manipulate water and lightning. It is technically not a monster spirit, so it's immune to the Heavenly Formation of the Black Tortoise. (Chapter 105)