The Trial Court shall have original jurisdiction, not otherwise reserved to the Supreme Court, over all cases and controversies arising under the Constitution, laws, and customs and traditions of the Osage Nation. Any such case or controversy arising within the jurisdiction of the Osage Nation shall be filed in Trial Court before it is filed in any other court, unless otherwise provided in this Constitution. This grant of jurisdiction by the Osage People shall not be construed to be a waiver of the Osage Nation’s sovereign immunity.