I am looking for a word to use in describing a non-living object being brought to life, such as if there was a rock on the ground, and it somehow morphed into a monster form of itself with legs and arms to fight. This is a silly example, but I hope you see what I mean. Thank you in advance.
No such thing as a bad question. You describe very well what you are after. Here are some possibilities, each with a different connotation: animation or "from an inanimate to an animate object"; personification (as in "the sun smiled" or "the birds greeted the morning"); "came alive" or "seemed to come alive"; "morphed" meaning "changed shape"; "the imagination gave life to..."; "transformed from a lifeless form to a living thing"; but the best is "It seemed to metamorph" (or simply the slang short form: "morph") as in the ancient work Ovid's Metamorphosis, a text listing the changes in forms of various mortals and immortals in Greek mythology. Many change from animate to inanimate, the opposite of your example. "Transmogrification" seems too formal and not quite accurate. The simplest answer might just be "transform" as a verb: "The rock was transformed into a dragon..."