Lore Summary

## Main Premise

XDU's storytelling gimmick is the Gjallarhorn, a game-exclusive relic that bridges universes/timelines. Characters can use the Gjallarhorn to travel between universes, for drama and shenanigans. As of now, there are a few different universes we've been to in XDU, or that characters have come from.

## Known Universes

### Main Universe

This universe contains all the canon events of Symphogear (through AXZ), most of the simple costume events, and the XD Quest. All Event stories are canon in this timeline, even if they didn’t take place in it. The biggest major difference from canon is that Main Universe Miku wields a Shenshou Jing pendant taken from Grayverse. The main six gear users plus Miku are native to this universe.

### Kanadeverse

In this universe, Tsubasa died at the concert while Kanade survived. This is the universe the black-colored "Karmanoise" are evidently native to. Ryoko is still alive and does not seem to be a vessel of Fine in this AU. Kanade is the only known Symphogear user native to this universe. This universe is also home to XDU's "Good" AXZ Alchemists, as well as XDU's "Good" Carol.

### Grayverse/Edgeverse

Home to Gray "Edgy" Hibiki. In this universe, Hibiki was separated from Miku after the concert and developed a rather different personality as a result. This is the universe Mainverse Miku obtained her Shenshou Jing pendant from. Gray Hibiki's Gungnir is destroyed in this universe, leaving the only known active Symphogear user as the Tsubasa native to this universe.

### Serenaverse

An alternate universe where Serena survived the incident with the Nephilim at the FIS research lab, but Maria, Shirabe, and Kirika were killed. Due to being critically injured in the event, she was placed in cryostasis, which is why she's still physically 13 despite the timeline having advanced several years since the Nephilim incident. Serena is the only known Symphogear user native to this universe.

### Adultverse

This is a strange alternate universe where Genjuuro, Ogawa, Dr. Ver, and Fine have Relic-based, non-Symphogear weapons they use to combat Noise. Also, Chris’ parents are alive in this alternate universe (and the Chris native to it has died). There are no known Symphogear users native to this universe.

### Sharonverse

Home universe of Sharon and the Yantra Sarvasva extant in XDU, a relic that grants control of machines. Sharon’s deceased mother is stated to have been an Attuned and fought Noise using a Symphogear, but the exact nature of her anti-Noise combat is unknown. Additionally, a recent event has added a new Tsubasa and Chris native to this timeline, with different personalities.

### Stroganetteverse

In this alternate universe, Hibiki and Miku’s trio of friends from S1 (Yumi Itaba, Shiori Terashima, and Kuriyou Andou) are armed with Symphogear-like relic weapons called Mechvaranus. They exist as part of an alternate-universe Second Division controlled directly by Fudou Kazanari. There are no known Symphogear users native to this universe.

## Timeline

The following image offers a summary of the timeline (as of Nov 2019) as presented in XDU - image originally created by Twitter user @zubabababaaaan, translated by Kanade∞Anon:

* The above text is adapted from the guide by Millhi and Kanade∞Anon