SIDEARM / Triarch Repeater
Triarch Repeater Location and Route
Blackwell Cavern, north of Castigator’s Keep.
Location at a glance
Type: Sidearm. Prerequisite: Descend behind Castigator’s Keep Beacon and follow the northern cliff path.. Missable: No. All eight sidearms remain obtainable in free roam before New Game Plus.
How to get Triarch Repeater
- Descend behind Castigator’s Keep Beacon and follow the northern cliff path.
- Enter Blackwell Cavern and collect the sidearm in the first illuminated area.
Why this route matters
Sidearms occupy a separate upgrade lane from melee weapons. Mark the dungeon or boss gate on the map, then return to Marrowkeep when the Obsidian Lathe is available.
Evidence notes
- Blackwell Cavern, north of Castigator’s Keep. checked route
Sources
- Mortal Shell 2 All Sidearm Locations Launch guide · checked 2026-08-25
- Mortal Shell 2 Guide Hub: Collectibles, Bosses and Trophies Launch guide index · checked 2026-08-25
All weapon locations · Best weapons by job · Weapon upgrades
Build role and upgrade context
Role: Sustained ranged pressure. Use repeated shots when an enemy exposes a face, appendage or recovery state that is unsafe to reach in melee.
Pairing: Proxima or Tiel / maintain pressure while moving. Sidearms share the Obsidian Lathe upgrade path, so record the route before spending scarce materials.