History of Broken Deep Flawless Solo Mastery

The The Broken Deep is a Lost Sector in The Impasse on the The Pale Heart, added with Destiny 2: The Final Shape. Reaching it: from the Impasse spawn, open the map and head south toward the Lost Sector icon, hop across the marked pillars, then follow the path past rusted vehicle skeletons upward; the entrance is on your right (per the Escapist guide).

This triumph requires clearing the sector on Master difficulty, solo, without dying (flawless).

How to complete

• Master setup (per a Destiny Tracker listing, not opened in full): Overload and Unstoppable Champions, Arc and Solar shields, Strand threat, Dread and Taken enemies, with Locked Equipment and Extra Shields as modifiers. Bring Overload and Unstoppable anti-Champion mods and weapons matching the shield elements.
• The sector is described as full of tight rooms and platforming (Escapist), so mob management in confined spaces matters.
• The end boss is a Dread miniboss that periodically shields itself. Destroy the floating splinters scattered around the arena to break the shield and open a damage window (Escapist, Destiny2Focus).
• Creator videos show solo Master clears on Prismatic Hunter (Microcosm), Prismatic Titan and an "invincible" Titan build; they are listed in the sources, but only their titles could be read, so builds are not detailed here.
• Master completions reward weapons at a 100% rate with an extra perk in the third or fourth column (Destiny Tracker listing).
• Flawless just means no deaths: play patiently, since the sector is cramped. Specific flawless tactics were not verified in text sources, so watch the linked videos.

Category

It is a Lost Sector mastery triumph awarded 5 points. Which seal or record page it sits under, and any reward, could not be confirmed from the pages opened; the in-game text lists no reward.