なります Or its root word なる Translates as "to become" You can only use them in two ways： １）If met with a なーAdjective, Place a に In between the adjective and なります／なる。 For example- 私はきれいになります。（I'm becoming pretty) ２）If met with a いーAdjective, replace the last syllable of the adjective with a く、Then insert a に After the adjective before ending with なります／なる。 For example- 私はつよくになります　（I'm becoming stronger) つよい（強い）Means Strong.

Unfortunately there is no sentence that goes をなります. As the others explained, なる basically means "to become".

I can't think of any examples where you'd use を with なる. Have you seen it somewhere? Do you have examples? It's an intransitive verb, so can't take a grammatical object as far as I know.