History of Festival of the Lost… Sector

Overview

Festival of the Lost… Sector is a seasonal Festival of the Lost story-type activity on Echo Mesa, Io (game data lists 750 power). The in-game blurb has Amanda Holliday asking Guardians to put on their masks and show the bad guys they can't keep us down, in the Sanctum of Bones. That is a Lost Sector reached from The Rupture, guarded by the Taken boss Pandrok, Pillar of Nothing, with Taken in three caverns and Vex in the fourth (per Destinypedia and search listings).

Mechanics

It appears to be the holiday-themed variant of that sector, in the style of Haunted Sectors: a decorated Lost Sector with a timer in which Headless Ones are summoned from Summoning Circles and a boss appears after enough kills, with Pumpkin Bombs breaking its shield. I did not find a source describing this specific entry, so treat those details as the general Haunted Sector format (Game Rant).

Rewards

Festival loot and Spectral/Manifested Pages progress, per the generic Haunted Sector format; no entry-specific loot confirmed.

Related

Haunted Sectors, Haunted Sectors Playlist, Sanctum of Bones (Legendary), Lost Sector.