There's an upright piano sound, heavily treated and washed in reverb, using Lekko, by Felt Instruments. That's doubled with a celeste, done with Spitfire Orchestra. The tympani rolls are Spitfire's Hans Zimmer Pro library. I used Spitfire's Albion Solstice for the folk fiddle sound that comes in and out.
The lower midrange arpeggiated synth is Synthmaster 3.
I used 3 instances of Ffosso for all other sounds: the stones rattling, the string sounds that aren't really strings (saturation/slight distortion via Plugin Alliance's Looptrotter Sat2Rate 2). Very low in the mix is an electronic kick I did with Softube Heartbeat.
I used Eventide's Temperance Lite for the Felt piano reverb, in a heavy wash. The overall reverb is ADPTR Utopia.
All instrument tracks were run through SSL's 4000E console emulation; from there into buses where I used SSL's Bus Compressor 2. I generally have buses for piano, strings, orchestral percussion, miscellaneous percussion, synths, and combinations, like the Ffosso stuff.
The stereo bus was treated with SSL/Harrison's mastering EQ, another instance of SSL's Bus Compressor 2,
That's it.