Monsters

The Monsters (化物, Bakemono), are a race of creatures in Tales of RWBY series created by Monty Oum and Yoshiharu Gotanda. They are a type of creature beings who have been effected by the Daemonblight from the Scarlet Night event. One factor which effects the if the output of a being is set to remain or become a monster is malevolence, the darkness in a being's heart and is often seen as a dark shade of purple in the form of bubbles or a gas being emitted of other living beings.

Like Malakhim, monsters do not have a set form. They always appear as completely enveloped beasts. There are humans who have not become monsters but have the like of their powers residing within them. This causes those with visible changes to be shunned by the outside society and leaving them to be tormented or thrown into prison such as Titania, specifically built for the capture of monsters.

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 * —About Monsters.

Description
Humans, animals, and even objects, affected by the daemonblight turn into monsters. The form that a creature affected by daemonblight will assume is hard to predict, but some humans will often turn into things like lizards or werewolves. In actuality, daemonblight does not exist, being a term coined by the Abbey since anyone or thing can become a monster if malevolence, otherwise known as the impurity or darkness within a human heart, overflows them. If such information got to the public, it would result in mass panic and hysteria, as well as mass transformations into monsters. A tragic incident from several millennia prior to the events of the story resulted in humans being able to see monsters. There exist various species of monsters, such as therions, who feed on others to gain strength.

According to the malak Zui Fuu, who resides in The Heavenly Steppes, the existence of such malevolent creatures are the result of a curse that was imposed upon humans and malakhim, spirits who left the heavenly realm to live side by side with humans, by the seraphim who remained in the heavenly realm to ensure that coexistence would never happen.