Flute of Silence

What we know

True name: Flute of Silence — revealed by ritual Identify on the road to Wizard of Wines (Session 23 @ 01:32:15)
Appears very old and carved from amber; sound is tranquil and oddly calming (Session 10 @ 00:32:07)
Magical focus; +1 to Vicious Mockery DC (Session 10 @ 00:32:07; confirmed Session 23 @ 01:32:36)
Party called it the amber flute before identification (Session 10 @ 00:32:07; Session 23 @ 01:29:12)
Mercurio attuned Session 10 (Session 10 @ 00:32:07)
Sylalys left it at Blue Water Inn when departing with Ireena Kolyana (Session 10 @ 00:25:38)
Sylalys claimed she found it in bushes days earlier; warned Mercurio was "doomed" but would be fine in ten days (Session 11 @ 00:24:53)
Identify sense: no new property beyond the +1 DC, but deeper magic remains undiscovered — party has "only scratched the surface" (Session 23 @ 01:32:36)
Party believes megalith melodies heard at the Old Bonegrinder Windmill and similar sites are somehow related to this flute (Session 23 @ 01:32:36)
Playing it toward a fleeing Mountain Folk shaman (Performance 20, Religion 17) briefly transported Mercurio to a vision of snow-covered southern peaks with similar figures; shaman fled (Session 23 @ 01:26:50)
Mercurio plans to try the megalith song on southern shamans later (Session 23 @ 01:33:24)

Sylalys: "Ah, I see you found that relic" when party noticed the flute (Session 11 @ 00:24:53)
Used to calm Henrik during the coffin-shop intrusion (Session 10 @ 01:25:22)
Saturno suggested playing a friendly song when the party spotted the shaman south of Old Svalich Road (Session 23 @ 01:25:33)