I noticed the ascended rings’ infusion slots are marked as either defensive or offensive. I also noticed that we can purchase very basic agony resistance infusions from one of the merchant golems inside the FOTM foryer. Unfortunately, the vendor there only sells a basic defensive AR infusion and something called a “versatile” infusion.
The basic defensive infusion fits only defensive slots and costs 75 fractal relics.
The versatile infusion fits both defensive and offensive slots but costs 225 relics.
As you can see, the vendor doesn’t seem to have any basic offensive AR infusions for 75 relics. I wonder if this was just an oversight.