I've noticed that sometimes the equipment's unique perk doesn't stay the same when I change it, it switches back to what it was before after I leave the inventory, and the game sometimes doesn't save correctly
Might also want to think about changing how strong the effect is for the perk of being bellow 33% health and doubling regen and block, or regen and lifesteal, especially for aoe centered builds
maybe have it so they have diminishing returns or limit the maximum that you can have of them, I was trying to farm amber but I couldn't die so I was extremely disappointed when I wouldn't be able to bring in all the amber I had made
I believe that I had bought the ice diamond replacement, and then I purchased the ice diamond as an extra weapon, I'm not sure, I'll try to recreate it to be sure
I think it has something to do with the final boss, cause whenever I finish killing enemies in the three zones and pick up the tome nothing happens to my stats