Ink

Ink is a valuable resource in the game, obtained through various means such as defeating enemies, completing camps, and solving rifts. It is specifically used to acquire tattoos, with different tattoos costing different amounts of ink. In order to fully explore the game map, a total of 1,405 ink is required, with the first six tattoos costing 345 ink collectively.
Apart from regular ink, there is also "Story Ink" that is rewarded for specific accomplishments in the game's narrative. For instance, defeating the Librarian grants the player 50 ink, while saving the Tattooist from the library in James' Limbo rewards 60 ink.
Rifts are hidden across the game's limbo world, and interacting with them correctly yields ink rewards. These rifts, marked by purple color, provide clues within the surrounding environment to guide the player in solving their challenges. Each rift has its own unique puzzle to solve, and successful completion results in receiving ink. For example, the first James rift requires translating Roman numerals into numbers and rewards 15 ink, while the second James rift requires inputting a specific symbol found on a nearby wall, granting 5 ink.
Burrows, which appear as swampy water areas with red tentacles, hold large amounts of ink. By utilizing the ground pound attack and defeating the monsters lurking within these burrows, players can obtain 30 points of ink. The locations of these burrows vary across different areas of the game.
Camps serve as checkpoints in the game, and each camp features a locked cache that contains ink and other rewards. Opening these caches not only grants ink but also prevents respawning of enemies in that area. The code to unlock the caches becomes progressively more challenging, but some answers can be provided to ease the process. Each camp has its own unique challenges and rewards. For example, Camp Zeta in James' Limbo requires inputting a code into a lockbox and rewards 10 ink and 6 BNP (another in-game currency).