[CHAOS] Entity + Texture Question and Script problem

[Daemian]

For the item problem, if you want to get a message when you try the key on the door, you should put the debug message in your function bloodkeyondoor.

Have in mind, also, that the SetMessage function may fail if your language file has an error.

About the custom entities and alike, doing as TheChaser said should work fine.
However, if you still want to have the files in your custom story's folder now, you gotta include that directory in your resources.cfg in order to let the editor find them.