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After having crafted three Egos, and then fusing them with the weapons and accessory, my connection with such items had increased. Perhaps now that they were "alive" but the bonuses I got from them by holding them and wearing them are now something like a link, as long as I have the link, I always get their bonuses no matter what.
This means that even unequipping them, throwing them around and more will still give me their bonuses. However, the farther away they're from me, the less bonuses they'll give, but that's nice anyways, it is way better than before.
But aside from that, there's more. After linking with the Egos, which is literally fusing with them, my soul and body suddenly grew stronger a little bit, and that means that my Stats went up permanently.