I have an ascended piece of equipment with a defensive infusion slot, which currently contains a +3 agony resistance infusion. I have now crafted a +6 agony infusion and I would like to replace the current one with this new, better one.
However, agony infusions can only be applied to unused defensive infusion slots. How can I replace an existing defensive infusion with a new one?
Best Answer
This is not true. Just like upgrades, infusions can overwrite other infusions normally. The problem you are having is that you are trying to place a +6 Agony Infusion into a Defensive Infusion Slot, which is impossible. +X Agony Infusions can only be placed in agony infusion slots (emphasis mine):
If you want to place agony infusions in a defensive, offensive, or utility infusion slot, you have to use things like Versatile Simple Infusion. The Versatile Basic Infusion you are likely using currently is one of these so-called Omni infusions.
See the Infusion page for more info.
That said, if you want to extract your infusions, which is particularly useful for upgrading the +X Agony infusions to a higher level, you can buy an Infusion Extraction Device. It is sold by Dessa's Crewe, who is only reachable after unlocking Fractal Mastery Level I.