<p>The entrance appears as a world change after completing "desecrating <strong>"desecrating shrines task" around 500 times </strong>around <strong>500 times</strong> since the last time the lair was closed.</p><p>I think you can keep the Lair open but you will have to do the job all the time.</p><p>Sometimes it may happen that the bottle will be there for <strong>3 days in a row.</strong></p>