1) Alter 2) Bestialise 3) Change 4) Give animal-like qualities to 5) Make brutal and depraved 6) Modify 7) To make like a beast 1) Bestialise 
• (v. t.) To make bestial, or like a beast; to degrade; to brutalize.
Bes'tial·ize transitive verb [ imperfect & past participle Bestialized ; present participle & verbal noun Bestializing .] To make bestial, or like a beast; to degrade; to brutalize. « The process of bestializing humanity. 
[v] - make brutal and depraved
bestialise verb make brutal and depraved; give animal-like qualities to
to make bestial or beastlike: War bestializes its participants.