Not just the most obscure album in your top ten - I'm thinking about albums that sound like they should have been critically adored, but just seemed to be widely ignored for some reason.

Foxing - Dealer
Had no idea until just now that these guys are supposedly an 'emo revival' band. Dunno what the rest of their stuff sounds like but I'd place this album somewhere between Frightened Rabbit and Daughter.
https://www.youtube.com/watch?v=h3w-leixvpw

Outfit - Slowness
Bits of Talk Talk, Wild Beasts, and the quiet end of Hot Chip. Proper DiS fodder.
https://www.youtube.com/watch?v=8hFl0_do9aU

Helios - Yume
Incredibly beautiful, chilled, melodic electronica / ambient.
https://www.youtube.com/watch?v=rpORE1CqTiY

Anna von Hausswolff
BIG, GOTHIC CHAMBER POP. Some late love on here admittedly. If Julia Holter can do it, no reason why this shouldn't.
https://www.youtube.com/watch?v=TU07z8N1V40