If you have arrived at Lake Cynon and are looking for the Vault of Forbidden Knowledge in the area to get high-tier loot in Hell Is Us, I’ve got you covered.
Lake Cynon is the fourth region in the game that you visit after acquiring the Keystone of Grief from Vitalis in Vyssa Hills.
And unlike other areas in the game, it is small and doesn’t have that many POIs, since most of the things there are underground, within the Lymbic Forge and the dungeon before it.
However, despite that, we have a Vault of Forbidden Knowledge hidden in the area where you can find high-level weapons, Glyphs, and other things.
But, just like other vaults, to access it, you must solve a combination puzzle that represents human emotions.
And this is where this guide comes in handy!
Where to find Lake Cynon vault in Hell Is Us

You can find the Lake Cynon vault inside a cave whose entrance is near the shore, right below the public area with tables and collectible items at the end of the road.
Follow the downward slope and then the marked path in the above screenshot.

At the end of the path, on the right side, you will find the cave’s entrance.

Go inside.

Interact with the vault door.
How to solve the Lake Cynon vault combination puzzle

The solution to the Lake Cynon vault combination puzzle is: Vigilance, Grief, Loathing, Ecstasy.
The Vigilance symbol is the one that you see in the first dial in the above screenshot.
The Grief symbol is the one that you see in the second dial.
The Loathing symbol is the one that you see in the third dial.
And, the Ecstasy Symbol is the one below:

Everything you find inside the Lake Cynon vault in Hell Is Us

Here is the complete list of items that you find inside the Lake Cynon vault:
- Glyph: Perfect Guard Elite and Lymbic Slivers Elite
- Relic: Memoria of the Phol
- Amine Prism: Theta
- Leveling material: 5x Steady Tuning Stone
- Lore and Research items: Scion Namir Adam Painting, Ascendance of Hellion Lodges Part 1 Tome, and A Dire Cost Parchment
Lymbic Slivers Elite

Scion Namir Adam Painting

A Dire Cost Parchment

Amine Prism – Theta

Memoria of the Phol Active Relic

Perfect Guard Elite Glyph

Tome Ascendance of Hellion Lodges Part 1

Tuning Stone – Steady

That sums up my guide on where to find the Lake Cynon Vault in Hell Is Us and its combination puzzle solution.