Mephistopheles X

Mephistopheles X is the origin timeline of the RDF and its members. The timeline and its branches are considered as those occupied by the Terran Republic, whom Task Force Sans Seraph and the crew of the Endless Endeavor hold allegiance to. Two known major fork events exist, designated +1 and +2.

Mephistopheles X+1
The first recorded major fork of the Mephistopheles timeline, as designated by the Republic Defense Force expeditionary detachment, Task Force Sans Seraph. The event which is deemed as the fork point is the displacement of Dr. Lucy Ashworth from the timeline. At least one branch is known to exist in which Dr. Ashworth goes missing from the timeline, where she claims to have been trapped in a 5D void for perceived eons. The other branch is where Dr. Ashworth does not go missing from the timeline, which leads up to the subsequent fork, +2.

Mephistopheles X+2
The second recorded major fork of the Mephistopheles timeline. The event which forks off is the disappearance of the RDF ship, Always Unto, and subsequently Master Sergeant John Opifex. The disappearance of the Always Unto was due to a catastrophic failure in its FTL drive, resulting in an FTL detonation. The nature of this FTL detonation was unique, as instead of obliterating the entire ship, split it into front and back. The front section remained present in the timeline, but the rear section was displaced from the timeline, including MSgt. Opifex, his assistant AI, SILIS, and the other crew aboard. MSgt. Opifex and SILIS only survived due to being within the FTL drive's sealed antechamber at the time of the detonation, as well as an extreme amount of luck.

Mephistopheles X+2A
Originating timeline branch for the crew of the RDF ship, Endless Endeavor, most notably Captain Elster Opifex, and General Alouette Opifex. After the disappearance of the Always Unto and its crew, a search was organized for the wayward ship. No traces of it were found until almost fifty years later, when the case was reopened by General Opifex. After a period of studying the traces of the anomaly left in the wake of the FTL detonation, the expeditionary force aboard the Endless Endeavor was organized, with General Opifex at the lead. The ship and its crew would follow in the wake of the anomaly, piercing through the starry veil with the intent of investigating what lay on the other side and determining if it were a threat, and for the retrieval of the Always Unto's crew.

Mephistopheles X+2B
Branch +2B is notably different from it's sister branch, +2A, primarily revolving around the search for the Always Unto. In this branch, the remaining front half of the ship was found just short of three years. A full team of RDF personnel and consultants were dispatched to the site aboard the RDF ship Indomitable Hope, where a rather fresh anomaly was left behind. In the following months, it would be studied greatly. Part of the research crew was Captain Alouette Opifex. While on a routine excursion to probe the anomaly for data, Captain Opifex was unknowingly pulled into the anomaly, displacing her from the timeline. She would shortly after be picked up by her other self's daughter, and brought to the Endless Endeavor where she would reunite with her father.