Top 5 of HiE story

Arrow 18 Mission Logs: Lone Ranger A mission to investigate a far off world takes an interesting twist. by AdmiralTigerclaw 66,018 words · 6,220 · 88
Eclipse A human colony vessel is sent to Equestria, and does not expect sapient inhabitants. by IncoherentOrange 24,254 words · 1,065 · 28
The Ash A disaster dumps alien matter on Equestria's surface, as well as one alien. by Raging Mouse 119,886 words · 441 · 15
Pericynthion While trying to escape, Nightmare Moon pulls something into Equestria that doesn't belong. by Skystrider 157,300 words · 766 · 23
Planet of the Ponies Falling from the sky is never a good idea... or is it? by LightStriker 87,995 words · 102 · 12

Top 5 Luna/MMMFavourites

Moonbound Princess Luna falls into a deep sleep, leaving Six companions to save her from her own mind. by Warmblood 50,173 words · 386 · 12
Night's Favoured Child With her new apprenticeship under Nightmare Moon, Empress of Equestria and Queen of the Eternal Night, the orphan filly Twilight Sparkle plunges head-first into the conspiracies, secrets and intrigues of the Empire. by Municipal Engines 151,320 words · 3,758 · 62
Luna's Story: Rise of the Lunar Stallions Luna falls comatose and is revived by the love-sick kiss of one of Celestia's guards. by Aegis Shield 44,461 words · 1,172 · 32