How to unlock dual sidearms in Mina the Hollower

In Mina the Hollower, players can unlock a second sidearm slot by meeting a few requirements.

Find Brandish in Ossex: Bowery, then level sidearms to 5.

Buy the Dual Sidearm Permit for 2,000 bones to equip two sidearms at once.

The upgrade expands combat and utility options.