Quick answer
Look west of Nochtean Gate near the Corrupted Gate route
Player directions place the Duality Stone in a dungeon near Nochtean Gate, west of the Corrupted Gate. Current guides specifically promote it for Axatana and Axe-and-Dagger-style attacks. Location video post
What Duality appears to do
Players describe Duality as adding an extra hit or effectively doubling certain dual-wield-style attacks. The community agrees it is unusually strong with fast melee and status application, but the reviewed evidence does not justify a universal “2× all damage” claim. Build discussion
Best current pairing
- Duality StoneThe central multi-hit interaction.
- Headsman's StoneCommunity-used critical support.
- Berserker's StoneAggressive melee support in the circulated setup.
- Status InfusionBenefits from repeated hit application when compatible.
Why it may be unavailable
Duality is not universal. If it is greyed out, the equipped weapon or sidearm does not support that stone in the selected slot. Switch to the intended dual-weapon setup and recheck the Combat slot.
Should you spend Tarcores on it?
Use it at Level 1–2 first. Community comments already anticipate a possible balance adjustment, so Level 3 is best reserved for a build you are actively using rather than a speculative future setup.