<p>When you unlock a creature all the itens items from Common to Rare will be displayed.</p><p>However very rare itens items will only be displayed if you have dropped them on that creature.</p><p>From <a rel="nofollow" href="https://tibia.fandom.com/wiki/Cyclopedia">wiki</a>:</p><blockquote><p>Very rare loot drops will also be displayed once you loot the item for the first time, as long as you have that creature fully unlocked.</p></blockquote>