Where do these drop? I am talking about the items in the inventory, where you can equip a total of 3 slots.
Boss Mode, I believe? I think you can purchase the Eye of Critical Damage in the regular item shop, I'm not sure though. I can confirm when the server is back up.
^ He's right. Though I'm pretty sure the ones you're referring to that isn't the Eye of Critical Damage, and also stack, aren't given out in Boss Mode Chest anymore. At least not all of them I mean. They used to come in Fantastic, Superior, and w/e the last one was but I'm pretty sure they only give out just one version now