The Monster Manual describes the origin of the Oblex as “a slime capable of assaulting the minds of other creatures. These pools of jelly are cunning hunters that feed on thoughts and memories.”

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The Monster Manual describes Liches as “the remains of great wizards who embrace undeath as a means of preserving themselves. They hunger for long-forgotten knowledge and the most terrible secrets. Because the shadow of death doesn’t hang over them, they can conceive plans that take years, decades, or centuries to come to fruition.”

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