Seen below are all the Key Items that will allow you passage to new areas on the Island. While some are required to continue the game, others are used to access hidden and mysterious areas or gain hidden knowledge and items. To every key, a keyhole.
Given by Jaret upon picking your first Creed
Defeat the Sodden Knight
The Watching Woods
Defeat the Kraekan Cyclops
Sunken Keep
Castle of Storms
Hager's Cavern
Defeat the Disemboweled Husk
Ziggurat of Dust
Die attempting to desecrate a Sanctuary
Given by the Order of the Betrayer's Gatekeeper if the player has the Bloody Writ