I have a theory about it actually. Sombra being kept in reserve for season 9. Season eight already has Chrysalis and tirek confirmed to be major villains, so I'm thinking that since those two will get a resolve this season, 8, season 9 will finish off Gen 4. Sombras horn, found by discord, who gets corrupted by it, not just convinced to go down the dark path like tirek did. Sombra possesses him, takes control etc and conquers crystal empire. Knowing that the elements could stop him, he destroys the tree of harmony and possibly the elements or at least scatters them. So quest to retrieve them begins or if they're destroyed, to find a way to take sombra-discord down. Heartbreaking scene with fluttershy would be present once the mane six confront him first time round. Having fanciful hopes like this for the season is just gonna hurt in the long run when my expectations or theories go out the window but oh well. It's sounds cool right?
I have a theory about it actually. Sombra being kept in reserve for season 9. Season eight already has Chrysalis and tirek confirmed to be major villains, so I'm thinking that since those two will get a resolve this season, 8, season 9 will finish off Gen 4. Sombras horn, found by discord, who gets corrupted by it, not just convinced to go down the dark path like tirek did. Sombra possesses him, takes control etc and conquers crystal empire. Knowing that the elements could stop him, he destroys the tree of harmony and possibly the elements or at least scatters them. So quest to retrieve them begins or if they're destroyed, to find a way to take sombra-discord down. Heartbreaking scene with fluttershy would be present once the mane six confront him first time round. Having fanciful hopes like this for the season is just gonna hurt in the long run when my expectations or theories go out the window but oh well. It's sounds cool right?