Hidden Lairs are mini-dungeons that contain a Purple Rare Elite at the end. It has a 100% droprate of a random normal gem. However, there is a chance that upon killing the Purple Rare Elite that an “Explore Further” portal opens.

This portal allows you to earn a second normal gem by killing the second Purple Rare Elite.

However, how do Hidden Lairs spawn? I have found through hours of gameplay and observation that shrines and treasure chest variants have a % chance to respawn a Hidden Lair.

The maps I have charted all reveal that Hidden Lairs respawn near the location of shrines or treasure chests. So after seeing this pattern in my maps, I tested the theory. They trigger the respawn of Hidden Lairs, Bonus Quests, and Purple Rare Elites.

These example show you a correlation between where a Hidden Lair respawns, and what triggers their respawn.

Hope you enjoyed this article. Please, support Blizzplanet on Patreon (monthly) or PayPal (once), and follow us on Twitter, Facebook, YouTube, and Twitch for daily Blizzard games news updates.

BlizzCon 2019 Panel Transcripts