Looking for a pony game I played before

[Cozy Cloud 17]

I'm looking for a pony game, maybe you happen to know

Type: RPG(Gamemaker style)

Background: Sombra is a brother of Luna and Celestia, he was ousted for doing reserch on dark magic(and let Luna help him test it）.(The game use some awosome illustration during the story time)

Plot (maybe): Spike wake up and found ts in nowhere, something, Mane 6(?) disappear.
Then the 2 princesses and spike fight agast and bring back the "gray" Mane 6 (a grassland (RD)) (cloudsdale (FS), rockfarm (PP), Baltimare (RY), golden oak (TS).
Then they go to fight against sombra but faild and captured and finally beat him.

A screencap

[RafaStaryStory 3,680]

I think it's Harmony Eclipsed? The part at 3:30 from this video seems to match 100% your screencap, I haven't seen the whole story but from what I've seen so far it seems to have several elements that match your descriptions as the Mane Six disappearing, Sombra's involvement and Rainbow Dash in a grassland (actually meant to be Everfree Forest) (check out part 1 for these)

[Cozy Cloud 17]

13 hours ago, Rafa Stary said:

I think it's Harmony Eclipsed? The part at 3:30 from this video seems to match 100% your screencap, I haven't seen the whole story but from what I've seen so far it seems to have several elements that match your descriptions as the Mane Six disappearing, Sombra's involvement and Rainbow Dash in a grassland (actually meant to be Everfree Forest) (check out part 1 for these)

Oh my, that's definitely that one, thanks.  • ↄ • /)c •

[ZiggWheelsManning 11,499]

Some night I'll play this game eventually  

[Cozy Cloud 17]

6 hours ago, ZiggWheelsManning said:

Some night I'll play this game eventually  

It deserve  a good night.