Bestialize -

Used to analyze characters who undergo a transformation—either literal (turning into an animal) or metaphorical (losing moral compass).

To reduce to the state of a beast; to brutalize or deprave. Common Contexts: bestialize

Brutalize, dehumanize, animalize, degrade, and deprave. Key Considerations bestialize

Describing how certain conditions, like war, can "bestialize" participants by stripping away their humanity. bestialize

The word carries a heavy, negative connotation and is typically used to describe serious moral or physical degradation.

bestialize in British English. or bestialise (ˈbɛstɪəˌlaɪz ) verb. (transitive) to make bestial or brutal. Collins Dictionary

While related by root, "bestialize" is a verb describing a process of degradation, whereas "bestiality" refers to specific sexual acts between humans and animals.