Many of the items you find in Lost Relics are valuable limited items which are backed by the Ethereum Blockchain.
Unlike the majority of video games today, this means blockchain items are provably rare and truly limited edition items that you can own in your own Wallet.
It's entirely likely only a very small number of players will be able to obtain at least one of all of the items available in the game.
The items are tradeable on public markets and due to the rarity generally fetch high prices.
Some valuable items are used to obtain other valuable items through Quests. Some items will only drop in Adventures. Others will only be available through Quests, Events, and Encounters.