Crux and Final decision

Crux noun - The central part or aspect of something under consideration.

Final decision and crux are semantically related In some cases you can use "Final decision" instead a noun "Crux".

Final decision noun - A judgment disposing of the case before the court; after the judgment (or an appeal from it) is rendered all that remains is to enforce the judgment.

Crux and final decision are semantically related in indispensable content topic. You can use "Crux" instead a noun phrase "Final decision".