Mortal Shell 2 Duality Stone

The Duality Stone is found at the end of the Ravaged Tomb dungeon in the Ruins of Nochte. Solve the moving-slab pressure-pad puzzle, then follow the opened route to the final chest. ^[guide]

Its effect makes light attacks from the Axatana and Axe & Dagger strike twice, increasing hit count, critical opportunities, stagger, and status buildup. It is therefore a natural pairing for rapid light-attack builds.