I am the QA on most of the updates and we had a long conversation about the relics when I was first introduced to the idea of these. Initially, I was also against the idea of making these effect be permanent for the account, because I knew these would just get funnelled into the hands of the ultra rich. But given the fact that these are tied down to the accounts who originally received the items, the items have to be OP for players to consider making the effort to hunt down these creatures.
Ladso's eye, arguably the most controversial relic, was actually the very last bonus that we were struggling to come up with. We almost went with +5000% awareness boost as the bonus, but then changed it to ability to re-read books as it made sense thematically and it is something that is quite sought after from the player perspective. Is it OP? Absolutely, it is meant to be OP. Will it allow a single player to suddenly become like Deft or RGiskard, definitely not. All of the items that you can use with books are gated by cooldowns. The item will give a massive boost to a single player based on how effectively they juggle between books, but they won't become a killing machine overnight.