> For the complete documentation index, see [llms.txt](https://riventide.gitbook.io/whitepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://riventide.gitbook.io/whitepaper/gameplay/hidden-monsters.md).
# Hidden Monsters
DISCLAIMER: All content here in is subject to change as the meta evolves through development, testing, and community feedback. No part of the Whitepaper is to be copied
Hidden monsters are special rare monsters that only appear once the player purchases the "Hidden Monsters" meta-upgrade for their respective Biome from Sir Tiberion at Pilgrim's Rest, who begins appearing there after the player either wins a run or speaks with him on six separate occasions across multiple runs. Each "Hidden Monsters" meta-upgrade requires six different non-Shifted Mementos of monsters from that Biome. Once unlocked, it costs 200 Riven Crystals to purchase.
Each Biome has two Hidden monsters. Encounters that include Hidden monsters are called Hidden encounters. Upon entering a Zone, there is a 20% chance for a non-Champion encounter to be a Hidden encounter. If an encounter is Hidden, a Hidden encounter loadout is randomly chosen. These loadouts may include two Hidden monsters of the same species or even two different species. There can only be up to one Hidden encounter per Zone.
If the player has the "Shifted Monsters" meta-upgrade, each monster (for which the player has a Memento) in a Hidden encounter has a 15% chance to be Shifted, which also includes the non-Hidden monsters. The "Shifted Monster Finder" meta-upgrade further boost this chance to 30%.
The Pilgrimage Path Hidden monsters are Jotunn and Catzerker. Click here to toggle the loadout list for Pilgrimage Path.
## Forbidden Fortress
The Forbidden Fortress Hidden monsters are Cherufe and Dark Elder. Click here to toggle the loadout list for Forbidden Fortress.
## Garden District
The Garden District Hidden monsters are Minokawa and Nixe. Click here to toggle the loadout list for Garden District.
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