Currently there are at least three significant differences in the separated galaxies of Odyssey and Horizons:
* I'm not completely sure it was update 10 that changed the behavior of the obelisks, it may have been update 9 but it was somewhere around that time.
EDIT 19 August: Note that this post was made prior to the end of the Azimuth Saga, which is why it doesn't mention any of the differences that appeared after the firing of the Proteus Wave.
- Palin's old base in Maia: In Horizons it's gone, there is just a bit of wreckage on the ground where it used to be. In Odyssey, the base is complete and dockable (although it has no active services). Logging out while docked at the base and attempting to load Horizons results in an orange sidewinder.
- Guardian Obelisks: Since update 10*, in Odyssey guardian obelisks all show rapidly change glyphs instead of specific glyphs of the items required to activate them. In Horizons they behave "normally", still showing their required items. This makes it impossible to complete Ram Tah's quests in Odyssey without consulting community produced guides to know which items to carry while scanning.
- Non-Human Signal Sources in Sosong, Didio and Novas: When Salvation fired his superweapon in these systems after the two-week CG, all the thargoid signals disappeared. A few weeks ago in Odyssey they all returned. In Horizons they are still absent. No mention of the thargoid incursions returning has been made on Galnet, despite these systems being fairly high profile for each of the superpowers.
* I'm not completely sure it was update 10 that changed the behavior of the obelisks, it may have been update 9 but it was somewhere around that time.
EDIT 19 August: Note that this post was made prior to the end of the Azimuth Saga, which is why it doesn't mention any of the differences that appeared after the firing of the Proteus Wave.
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